Questions tagged [browser-extensions]

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

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How did Avast browser extension get installed into brave? [migrated]

How did Avast browser extension get installed into my Brave browser? This is on a laptop using Windows 10. I used Avast for a long time, then switched to Norton 360. I ran the various removal tools ...
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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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1answer
54 views

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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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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1answer
173 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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1answer
205 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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89 views

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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1answer
67 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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41 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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1answer
217 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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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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How to securely use crypto wallet extensions?

Browser wallet extensions that let you interact with dapps are required to access different crypto-related services. These (to mention a few: MetaMask, Fortmatic, Tron wallet, etc) often require ...
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1answer
97 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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2answers
118 views

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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55 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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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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441 views

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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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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1answer
78 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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2answers
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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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1answer
220 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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1answer
887 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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1answer
118 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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701 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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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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1answer
64 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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1answer
69 views

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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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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5answers
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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1answer
134 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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2answers
416 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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1answer
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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3answers
834 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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1answer
74 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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1answer
282 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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539 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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1answer
229 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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1answer
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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1answer
66 views

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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2answers
372 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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1answer
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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0answers
77 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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1answer
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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2answers
11k 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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1answer
115 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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1answer
129 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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2answers
467 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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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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175 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: ...