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Questions tagged [browser-extensions]

Browser extensions are additions to a web browser that provide extra functionality.

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GPU vs integrated graphics hardware, browser canvas fingerprinting, and multi- or dual-boot systems

My goal is to ensure that two operating systems installed side-by-side on the same device are unable to return the same canvas fingerprint, when a modern browser is allowed to run javascript without ...
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1 answer
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Can adblocker plus read your sensitive data or spy you? [duplicate]

Do adblockers read your sensitive data? https://adblockplus.org/ I'm referring to this, its open-source but I feel worried.
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2 votes
2 answers
149 views

How to do auth without user interaction in an enterprise environment?

We are building a Chrome Extension that will be force-installed on each employee's browser for the companies we work with. We currently use OAuth but many employees are forgetting to sign up. We are ...
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2 votes
1 answer
273 views

With HTTPS-only mode in Firefox, may I still need HTTPS Eveywhere addon?

Firefox has a built-in toggle in settings to enforce HTTPS-Only mode. When enabled, the browser attempts to redirect to HTTPS every time and, if fails, blocks access to the website in the same way ...
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0 votes
1 answer
259 views

Why are there no modern web browsers that allow extension access to SSL information about the site you are browsing?

In all my Googling, I found one version of FireFox that allowed it temporarily a long time ago, it has been discussed on the Chromium development forums for years, but yet, as of today, there is still ...
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0 answers
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Security of Third Party Plugins in Thunderbird

In Thunderbird (a popular open source email client), there is an extension store similar to Mozilla Firefox which adds further functionality to the client. Mozilla has an article detailing the ...
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0 votes
1 answer
108 views

Firefox add-ons: Which permission(s) govern the ability to make additional network requests?

I'm considering installing a Firefox add-on (browser extension) which requests the permission Access your data for all websites. This add-on is not on the list of Mozilla's "actively monitored&...
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0 votes
1 answer
71 views

Does moving webAuthn API from browser to OS improves security of registration process?

Usually, for all types of authentications, we trust the registration process and assume there is no attack is happening Like in the case of FIDO2 registration. However, as the registration process is ...
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0 votes
1 answer
251 views

Is there malicous HTML?

I'm writing a chrome extension that evaluates certain code blocks from GitHub pages, e.g., Lorem ipsum ```html-embed <iframe></iframe> ``` dolor site amet. and adds their content as HTML ...
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0 votes
1 answer
128 views

Can I curb Honey's grab for my data by only using it within a separate profile?

I'm interested in getting a coupon code for an online purchase and to this end Honey is nice, but when it comes to protecting my data Honey is really invasive. Can I curb Honey's hunger for my whole ...
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1 vote
1 answer
136 views

Chrome extensions: tool to notify users of ownership change (to avoid malicious code injection)?

A problem with Chrome extensions was raised in an earlier question: extension owners can sell their extension to another owner, who can then insert malicious code. From a user's perspective, they may ...
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Practical ways to tell if a Chrome extension is safe? [duplicate]

After reading about Emails a browser extension developer gets from scammers (and the comments here) I understand that there are people who try to convince good addon developers to introduce shady (or ...
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2 answers
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Does an effective Content Security Policy mitigate a universal cross-site scripting vulnerability?

I am doing some background research into types of XSS and prevention and as I understand it there is not much any application can do against a universal XSS in a plugin or browser. A last line of ...
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83 views

Web Browser Forgetting Between Users

I am planning to go door-to-door and host events in which people use a computer to login to the Arizona Secretary of State website, enter sensitive information (like address, social security number, ...
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3 votes
0 answers
135 views

Can Chrome extensions access other Chrome extensions' data?

Can the data in a password-manager Chrome extension be accessed by a different Chrome extension? For example, if one were to install a malicious extension, could that extension access the data (i.e., ...
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How to tell if my browsers are infected by ADROZEK?

MS has exposed ADROZEK: https://www.zdnet.com/article/microsoft-exposes-adrozek-malware-that-hijacks-chrome-edge-and-firefox/ I would like to know if the browsers (Chrome, blue ff) of my Ubuntu 20.04....
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2 votes
0 answers
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What is the threat-model of a malicious browser-extension accessing the data of *another browser-extension* that is security-critical?

Modern password-managers are moving towards a "fully-in-the-browser" model (see: historical RCE on LastPass, and now 1Password is also moving towards 1Password X as "the future" ...
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0 votes
1 answer
126 views

Is JQuery in chrome extension a security concern?

This is the relevant part of my manifest.json file: "content_scripts": [ { "css": ["style.css"], "matches": [ "<all_urls>&...
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7 votes
2 answers
324 views

What impact does an installed extension have on the browser fingerprint (uniqueness)?

Motivation I want to develop a custom, local Firefox extension and investigate, if its installation has any impact on the browser fingerprint. Background Some time (years?) ago, there were articles ...
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1 vote
1 answer
303 views

Chrome extension security

I want to install a Chrome extension called metamask. I do not trust this kind of software. (Maybe because I am a newbie) What can a Chrome extension do on my computer? Is it possible, for example, ...
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1 vote
1 answer
1k views

Authentication in Next.js application (SSR SPA with long sessions)

We’re currently developing a Next.js application (server side rendering) and are looking for secure ways to keep the users logged in for longer periods of time. AFAIK this can either be done using ...
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1 vote
1 answer
172 views

Securely storing a master key client-side

My company is currently evaluating a product which comes with a browser-extension-based password manager. The password manager is peripheral to their core product, but is the only way to use it. We're ...
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6 votes
1 answer
892 views

Can Chrome Extensions Send Data to Remote Servers?

Suppose an extension has a scary list of permissions like that below ("Site access: On all sites"): Does this also give the extension permission to send my data to the author's servers via ...
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0 votes
0 answers
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Chrome Malware, Redirects To Ad When I Click Link in Google? [duplicate]

I've been dealing with this Chrome malware for awhile now, and I can't identify where it's coming from. Very occasionally, when I click on a top link in Google, it'll redirect me to a site that looks ...
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0 votes
1 answer
93 views

Credential theft by browser conferencing software?

While using the webex conference software, I noticed that simply pressing a "share content" button allows me to share my full screen. There was no security confirmation from my webbrowser (chrome): I ...
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1 vote
1 answer
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Would it be a big security vulnerability if someone wrote a browser extension to retrieve personal information on Google's behalf?

I am a 6th grader working in a project and came across the following question: On most browsers, you can inject JavaScript code into the browser, for example by typing in javascript:alert('Injecting ...
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0 votes
0 answers
83 views

Domain Joined computer doesn't browser properly with any website with Let's Encrypt CA cert

Navigating to any website with Let's Encrypt CA cert and even after enabling the HTTPS Everywhere addon, I'm getting "Your connection is not private". Getting this error from all the browser except ...
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33 votes
5 answers
6k views

How do I know if a Google Chrome extension is leaking data?

Many Google Chrome extensions require permissions to read the contents of webpages the user visits. How can the user verify whether and to what extent a certain Chrome extension leaks data?
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2 votes
1 answer
162 views

Is this sufficient to verify a website's domain?

I'm building a browser extension that will run some javascript, which contains some sensitive information (essentially injecting authentication info). Therefore I want to make sure it only executes it ...
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-1 votes
2 answers
504 views

Can I get a double layer protection if I use both desktop & browser based VPN?

Let's say, if I use both NordVPN's own software (random VPN location) and its Google Chrome VPN extension (random VPN location), does this add an extra layer of protection/encryption - means hiding ...
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40 votes
1 answer
6k views

Can a browser extension (Chrome, Firefox, etc.) read the web console log?

I realized that my bank handles sensitive information in the web console log, so my concern is if any browser extension could read the log?
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7 votes
3 answers
933 views

Browser setups to stay safe from malware and unwanted stuff

I have to set up a browser to surf the internet. I'm trying to stay safe from malware as much as possible. (I already know that there's no way to stay 100% safe.) My idea is to use Firefox with these ...
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1 vote
1 answer
115 views

Is using an access token for authentication a bad idea

Is it right that if there is a malicious browser extension allowed to "Read and change all your data on the websites you visit." on the users's machine an access token can be potentially leaked no ...
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-2 votes
1 answer
325 views

How common is the usage of browser zero-days in the wild?

We have an overview with known but fixed vulnerabilities for this browsers: Google Chrome, Mozilla Firefox and Internet Explorer. Such lists exist for many other browsers too. We also have such ...
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0 votes
1 answer
684 views

Chrome extension screenshots- privacy risk?

Is it possible for Chrome extensions to monitor users without them knowing by taking screenshots and/or video? There's an extension called Screencastify that allows you to record your screen. This ...
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0 votes
1 answer
263 views

Blocking Standard Users (Win 10) from Adding Chrome Extensions

I want to block standard users (Win 10) from adding Chrome extensions. When the standard user renames the default folder, it overwrites any security policies applied on the Extensions folder.
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1 vote
1 answer
1k views

Installed sketchy Chrome extension - Potential malware infection?

So... Tired me was browsing through Ikea's website this morning and tried to use one of their visualisation tool. Got an error message saying that I was not running the lastest version of Adobe Flash. ...
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0 votes
1 answer
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Firefox switches charset encoding, brings up request to install extensin. Is this a "browser virus"?

I use Devuan ASCII (~= Debian Stretch) on my desktop, with Firefox and Chromium as my browsers. As I came back to my computer today after a few hours of non-use, and loaded a new browser frame, ...
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3 votes
2 answers
438 views

Are some privacy add-ons superfluous when using Tor browser?

If running the Tor browser, should you still have the same privacy add-ons as you would if you were running a "regular" browser? Or will some of them be superfluous because of the built-in ...
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3 votes
1 answer
1k views

Understanding which privacy tools provide very similar functionality

https://amiunique.org/tools has a list of recommended privacy tools. uBlock Ghostery HTTPS Everywhere Lightbeam AdBlock Plus Disconnect Privacy Badger NoScript Self-destructing cookies However, aren'...
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2 votes
0 answers
112 views

Collecting PII in an iframe on any website. Is it Safe?

I am building a chrome extension that allows users to submit a form on any website. Once a user would visit a certain website, extension would open iframe on that website and ask user for some PII in ...
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0 votes
1 answer
8k views

Bitdefender showing lot of Getting Suspicious Connection Blocked from Chrome extension Toby

I'm using GetToby Chrome extension to manage my tabs and save them for later. Lately, I've been getting lots of notifications from BitDefender about blocked suspicious attempt: chrome.exe attempted ...
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17 votes
2 answers
13k views

Is Stylish safe to use again?

Stylish is/was a very popular extension for the Chrome and Firefox web browsers, which let users add custom styles to certain websites. I was using it myself, until a helpful fellow told me it was ...
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0 votes
1 answer
165 views

Why are there no browser feature or extension to only check the domain and username to prevent phishing?

One of the recommendations to prevent phishing using look-alike domain names (like www.google.com.phishing.org or IDN homograph attacks) is to use a password manager or a physical security token like ...
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  • 173
2 votes
1 answer
157 views

I found a browser extension I don't trust installed, should I worry?

Someone told me that their Firefox had a strange new menu bar. I found that it was “FindYourMaps”. FindYourMaps is a deceptive browser toolbar that supposedly allows users to find driving ...
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3 votes
2 answers
522 views

Google Chrome extension wants to be able to "manage apps, extensions...": reasonable?

One image can tell more than a thousand words... Is what this extension is asking for reasonable? There are (at least?) five actions it is requesting permission that I do not see what it would need ...
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11 votes
1 answer
1k views

Danger of browser extension without any permissions?

Assuming that an extension for Firefox or Chrome does not request any WebExtensions permission, what harm could this extension do? Or put another way: What (potentially malicious) actions can an ...
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1 vote
0 answers
204 views

Do WebEx's requirements open security holes?

After a WebEx presentation is recorded, the recording cannot be played in-browser without installing a browser extension that requires invasive permissions to access the user's data for all websites: ...
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3 votes
1 answer
174 views

Is it possible for page to get your installed extensions through javascript?

When you visit a page, could that page tell what extensions you are running if javascript is enabled? If so then could we stop them or at least make it extremely difficult to increase our privacy?
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3 votes
1 answer
364 views

Aren't browser extensions a critical security risk?

Lately, there was a lot of publicity given to such exotic security risks as Spectre and Meltdown, with immediate Pavlov reactions from Microsoft, Mozilla etc. However recently I came upon the (...
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