Questions tagged [browser-extensions]

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

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1answer
31 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
132 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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0answers
94 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
72 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
175 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
31 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
198 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
138 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
33 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
234 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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1answer
2k 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
90 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
102 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
210 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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1answer
987 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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0answers
91 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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1answer
129 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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1answer
124 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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1answer
56 views

Why/how is browser inserting inline SVGs at end of body?

Chrome is inserting the following SVG images at the bottom of pages: <span style="width: 24px; height: 24px; background: url(&quot;data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiA/...
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1answer
166 views

GET, “mailto” warning - how can I tell if a site is secure?

My password manager is giving me a warning when I go to certain sites. They say if I think I can trust the site to go ahead and use it .... this leaves me concerned I'll miss something. The pop-up ...
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1answer
32 views

What happens when a Firefox blocked extension is already installed and enabled/disabled?

Mozilla has been busy blocking Firefox extensions from their ecosystem due to security and privacy concerns. What happens when a blocked Firefox extension is already installed and enabled? What ...
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1answer
46 views

How do modern browsers isolate different addons?

A user may have multiple addons installed on a browser. But typically, the browser is running in userspace with an unprivileged uid. I was wondering how modern browsers can, in such a setting, provide ...
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2answers
226 views

How to choose Chrome extensions with security in mind

I find myself more and more in need of using Chrome extensions, but the appallingly broad and intrusive permission requirements prevent me from installing any of them. Pretty much every extension I ...
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1answer
50 views

Prevent reflecting page modified by browser extension

Suppose there is a trusted browser extension in a chrome browser that modifies the web page (like editing DOM, appending scripts, etc) I don't want anyone but me to see the page modified by this ...
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0answers
64 views

How to secure communication between page and browser extension?

In my browser plugin I want to detect any use of a built-in JavaScript function. I override this function by injecting a piece of code onto the page. This code then triggers an event, and an event ...
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0answers
52 views

Is authorizating add-ons in this way secure?

I have a website, for which I made accompanying add-on to Firefox and Chrome. Both of those are distributed privately. In Firefox they can be installed only from my website, and for Chrome the link to ...
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0answers
44 views

Are there known cases when malicious Javascript or Chrome/Firefox extension copied certificate from browser?

I have a certificate that must be manually installed on my browser in order to have a secure connection with a specific website. Are there known cases of malicious Javascript or Chrome/Firefox ...
2
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1answer
282 views

How do password managers implement secure browser integration? [closed]

Some password managers can automatically fill passwords in user's browser. But for this auto-fill to be secure, they have to make sure they are putting password in the correct input field, plus, the ...
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0answers
50 views

Is it possible to “polyfill” a vulnerable Flash player to a users machine when they visit a web page?

This is about the concept of adding "necessary code" to a webpage to ensure that any client can view the "content" provided through that page. This sort of code is sometimes referred to as a polyfill. ...
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2answers
60 views

Testing an untrusted browser extension securely on macOS

I have received a .zip file containg a browser extension for Google Chrome. How can I test this safely? Current options I consider: 1) Using a VM. Installing VirtualBox on my macos, and then running ...
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6answers
12k views

Are there objective reasons to not allow Google Chrome extensions, but to allow Firefox extensions?

Recently, the company I work for has forbidden usage of any extensions in Chrome. They also do not allow account sync. This affected virtually all Web developers since they use Chrome to test their ...
3
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1answer
160 views

Web browser account security

Please note that I've looked what similar questions have been addressed, but all I found was partial discussions. My concerns is about web browser, password managers, cookies and sessions. My goal ...
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0answers
253 views

Check if a Websocket connection origins from a Chrome extension [closed]

I am writing an application that communicates with a Chrome extension via websocket connection. I wonder if there is a way to detect whether the connection actually origins from the extension. The ...
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0answers
92 views

Can websites collect browser data without using http requests? [closed]

Is it possible for a website to collect data such as the plugins/fonts installed without sending it thought http requests? If so, is there any plugin for any browser that tells the user what type of ...
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1answer
174 views

How do I tell whether my browser extensions leak personal data?

According to the article Warning: Your Browser Extensions Are Spying On You: Browser add-ons for Chrome, Firefox, and probably other browsers are tracking every single page you visit and sending ...
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1answer
1k views

Can my computer be compromised by uBlock/Adblock filter list?

uBlock is open source and suppose I trust the author. But filter lists are something that is maintained by other people. Is it possible to add something to a filter list to compromise computer/browser,...
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4answers
992 views

What are the effects of the Chrome Web Developer extension hijack?

Today, the owner of the rather popular Web Developer toolbar noticed it had been hijacked and replaced with a malicious version. He disabled it, but the malicious version (diff) had been in the wild ...
2
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1answer
72 views

How can I programatically keep track of number of certificate warnings in browser?

I want to keep a count of how many certificate warnings have been made in the browser over a period of several weeks. I also want to keep track of whether the user ignored these warnings and just ...
1
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1answer
107 views

Go.redirectro issue [closed]

I have a hijacker problem "Go.redirectro" And it gave ma a horrible headache​ I tried registry editor and take a file by file deep look at my drive and uh god it took me long time Look i am a ...
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2answers
315 views

Password manager: master password or not?

I use several browsers for several reasons (surfing, downloading files, logging into accounts...) but I prefer Chrome for doing "risky" things like browsing websites which I don't know whether they ...
1
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1answer
103 views

Should I use different browsers for surfing and logging into accounts?

I use web in different ways, i.e.: a) to log into my accounts (email, google, social, forums, etc.); b) for downloading softwares; c) for surfing trusted websites; d) for surfing websites which I ...
2
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1answer
564 views

TunnelBear VPN Chrome extension doesn't encrypt DNS Queries

I'm using a VPN provider in occurance TunnelBear and decided today to run Wireshark in parallel and found out that DNS resolutions are happening un-encrypted using OS default name resolution, e.g. ...
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1answer
262 views

Help! What is this remote takeover / malware from a pop up, and what does it do? [duplicate]

I was recently on yts.pe a torrent distribution site. When I clicked on a torrent, there was a pop up, which Chrome totally didn't block, even though it is set to block all pop-ups. Here are the ...
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3answers
106 views

How to protect your web application's data against an injected Javscript?

I have a web application which interacts with two web servers. The response of the first one is stored temporarily on the browser (window.xyz=response.xyz) and when the user makes the request for ...
4
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1answer
230 views

Prevent Chrome extensions from betraying me

As has been discussed in this answer, a flaw with the Chrome Web Store is that an honest-but-naive developer may sell a popular browser extension to someone like Techno SoLotions, assuming that Techno ...
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2answers
486 views

Block Pop Up window using Javascript code

When a user enters his credentials in the login form of a web application, the credentials can be hacked through a malicious extension (that the user has installed). Now, suppose the malicious ...
3
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1answer
108 views

How secure is our privacy when using third party addons and extensions?

I use many addons and extensions in my browsers some of it is for ad blocking, taking screen shots and VPNs. This question came to my mind while using free VPN addons. I usually uses VPN addons for ...
66
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8answers
17k views

Why use HTTPS Everywhere when we have HSTS supported browsers?

I know that the browser's default protocol to access any site is http:// when https:// is explicitly not mentioned, but even then if we browse to a website say www.facebook.com, the response header ...
5
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2answers
561 views

LastPass vulnerability: Should LastPass users change all their passwords?

Reading about the recent vulnerability in LastPass extensions for FireFox and Chrome. The published exploit allows arbitrary code execution. The vulnerability also allowed access to stored passwords. ...
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4answers
95 views

To plugin or not to plugin?

Recently I did quite a research about internet browser related privacy. It hit me hard in the flesh myself, since I was part of the victims in the [WOT fiasco]1]. So I found out that usually way over ...