An open-source web browser developed by Mozilla. If relevant to the question, also include the tag of your operating system.

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9 views

How to merge 2 windows in Firefox

How can i merge 2 windows in Firefox Quantum, i.e. move all tabs of these 2 windows to 1 window?I have many Firefox windows open and want to merge 2 of them. So far Web searches merely turn up ...
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2 views

Firefox shows multiple PIN prompts for smartcard using OpenSC

I installed OpenSC 0.18 and added the PKCS11 DLL as a security device provider in Firefox 61. I can "unlock" my smart card from the Security Devices dialog, and get prompted for the PIN as expected. ...
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1answer
10 views

Changing Proxy Port in Firefox

I often find myself going to Firefox > Options > General > Network Proxy > Settings > Manual Proxy Configuration and setting the port.Option 1: Is there a way to increase the port number by one ...
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1answer
10 views

Minimum tab width in Firefox Quantum

Firefox Quantum changed the minimum width of Tabs, previous versions of Firefox had it set to a greater value.(*minimum tab width - when you have a lot of open tabs they shrink to some predefined ...
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6 views

Call to same-domain API from React website throws 401 on Chrome and Edge, but works on IE and Firefox

BackgroundI have a React website that posts a status update to an API on the backend, both are on the same server and domain.This POST is done using a wrapper function on top of fetch:export ...
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13 views

How to determine which preference file lock a Firefox config option

On a Windows 7 computer, My Firefox network.proxy.type is locked so I cannot modify itWhen looking at C:\Program Files (x86)\Mozilla Firefox\default/prefs/localsettings.js there are only 2 lines:...
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2answers
54 views

What happened to the old hamburger menu?

I remember pre-quantum Firefox having a hamburger menu with icons which you could customize:However my current version of Firefox (60.0) seems to have lost it in favor of a more classic menu woth ...
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1answer
57 views

I Need to Keep a Window Active

I need to keep a browser window active while I use another window. "Keep-on-Top" is not what I'm looking before because when I switch pages, it still goes inactive. I'm trying to keep a page ...
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15 views

Getting back to content pane from address bar in Firefox

When browsing a page in Firefox I can easily go to the address bar using Cmd + L. Is there a hotkey to leave the address bar and get back to the page?
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1answer
18 views

Firefox GCLI (internal command line) won't open

I’m used to pressing Ctrl+F2 to open the graphical command-line interpreter in Firefox. This is useful for taking screenshots of webpages and for restarting the browser when I’ve opened a ridiculous ...
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29 views

Tiny (unreadable) apostrophes and double quotes on some web pages

I'm using the latest firefox (Quantum 61.0) on a 4K display. Certain web pages are rendered incorrectly, in particular there's a problem with apostrophes and double quotes being so tiny as to be ...
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24 views

Linux Mint 18 upgrade breakes firefox and chromium? Needs vbox?

I've updated my firefox to latest version with apt on Linux Mint 18 Sarah. It now won't launch the browser gui. Starting from the terminal and using safe mode does not show any errors. Process ...
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1answer
19 views

.tabbrowser-tab[unread], background-image: linear-gradient not working in userChrome.css

I had this working before but now it stopped working. I have some code in my userChrome.css to create a small grey triangle in the top right corner of an unread tabhttp://superuser.com/* Mark new and unread tabs */....
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1answer
32 views

How to change the browser used for web results in Windows 10 Search

When I search for things in Windows 10, the (web) results open up in Microsoft Edge with the Bing search engine.I want the results to open in my default browser, Firefox Quantum (61.0.1 (64-bit)), ...
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1answer
43 views

Changing HTML5 videos playback speed

In Firefox you can control the playback speed of HTML5 videos by pressing F12 and typing the following in the console:document.getElementsByTagName("video")[0].playbackRate=1Although this method ...

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