Firefox Support Forum

I view a lot of pdf documents via firefox, the light gray background makes my eyes and head hurt after prolonged usage. In the past I found a solution on this forum that advised to set pdfjs.viewerCssTheme to "2" in about:config. This set the background of pdf viewer to black/dark gray. This has worked for years until recently when the pdf viewer switched to light mode again (pic 1). I checked the about:config settings for pdfjs.viewerCssTheme but there appears to be no change. I tried restarting the browser, setting the theme to 0 and to 2 again, updating browser. Sadly the theme is still light gray. Is there a way to change it again? The desired outcome is in pic 2. I do NOT want to change the color of the pdf pages themselves.

When I type my last name using shift + first letter, it always comes out in lower case, which wastes my time correcting. How do I set it back to using upper case with shift +?

Thank you.

I've always liked the Firefox New Tab page, with Pocket, and until today, DarkReader plugin has always worked. But now it says that it can't because the page is protected.

I tried the solution to use bookmarklets, suggested in https://support.mozilla.org/en-US/questions/1350781, but it didn't have any effect (https://sanketmehta7.github.io/DarkMode-JS-BookMark/

If I can't find a solution, I'll just ditch Pocket, and use Google as my first page, or something. Or maybe ditch Firefox, which doesn't seem to think that dark mode is important. I don't like being blinded by the light.

Firefox won't play YouTube videos. I've tried everything. There seem to be plenty of problems on the forum BUT NO SOLUTIONS!

I'm ready to switch browsers - permanently!

As long as I have an incognito window open, Firefox will reopen old tabs everytime I open a new "regular" window, even if "Open previous windows and tabs" is unchecked.

Why can't you pin the extension 'Tiny URL' to the toolbar any more?

This extension is really useful! I don't want to have to excavate Firefox to use it.

Tiny URL is more useful than the rather silly 'Pocket' which just seems to be a page full of adverts

Firefox for Linux has a bug where it is unable to drag a tab from a non-active window. As in, if the window focus is on Firefox window A and I try to drag a tab from Firefox window B to window A, I have to click first the window. I can't just intuitively drag the tab from a non-active window, because it will get ignored. It will just activate the window, ignoring the drag.

Firefox for Linux, running on Nobara KDE latest desktop. Confirmed also on KDE Neon latest desktop.

Starting this morning I suddenly cant delete or mark emails as read in Outlook.live.com. Even if I open an email, and it appears as read after that, if I refresh or leave the page and come back, its marked as read again.

I tried dropping all add-ons (a kill switch to drop all add-ons and re-activate them is still a feature I feel Firefox needs, I have to click every single one of them every time) to no avail.

I was in the process of writing this question on the Microsoft forums (which is usually like whizzing in the wind) when I thought to try a different browser. I had zero issues and Outlook.live.com worked perfectly normal on Microsoft Edge.

This HAS to be a bug in a recent update in Firefox

The Amazon.co.uk search plugin was working but now its not and when i try to click "add search engine" a box pops up with

Firefox could not download the search plugin from: https://d2lo25i6d3q8zm.cloudfront.net/browser-plugins/AmazonSearchSuggestionsOSD.Firefox.xml

another post suggested checking the about:config browser.search.region mine says "GB" which would be correct for .co.uk

All other search plugins work fine. Any suggestions?

I am accessing my ISP to download the security software. I need to be able to select the Operating System. When I click on the drop down box I am prompted for the OS, but when I select it the drop down box does not populate. I then get a message to select the OS. This works with Microsoft Edge.

Hi there - I accepted Firefox's prompt to "refresh" the browser and had no idea it would take away my add-ons. How do I get these back? I don't even remember what they all were, but I know they made a huge difference and now I can't believe all the ads I'm seeing and then my "facebook container" (and other kinds of container tabs) is gone too! How do I fix this? Can I undo the "refresh"??

Why do Cross Site tracking cookies show up after I shut down the browser and restart? I have my history set up to delete everything when I close the browser so I'm curious why cross site cookies are apparently allowed to exist/function, even after a restart?

Dano

Whenever firefox has multiple tabs open and on any single tab youtube is running i find youtube to crash lag and even crack itself by audio playing with struck video. FYI the same issue is not experienced in other browsers like brave for instance . I hope you provide attention to this problem and solve this issue as soon as possible and as I mostly use firefox to browse and use its dev tools.

I'm at a loss for words here. I have a website I frequent and it has a really annoying behavior. I'm a developer so finally I mustered the strength to do something about it. I googled how to create an extension in Firefox and within 5 minutes I had a working extension that solved their annoyance. However, I can only load it temporarily. If I close Firefox, it goes away. When I try to actually install it, it says I need to have it signed. I have now spent the better part of an hour trying to find out how to self sign it. I refuse to believe that I have to submit this to Mozilla for me to be able to install my own code. Can someone please send me in the direction of how i self sign and install my own extension. I have no intention of publishing, I only want to run this for myself.

Hello,

I have a platform where architects can download digital content in the file formats of dwg (autocad) and ai (adobe illustrator). The site is old and has been working for many years.

Today I received an email from a user that had issues downloading the ai files. I went on to the site an investigated. I am also unable to download the ai files. The dwgs are working as expected.

The ai files are converted to pdf and open in the browser in some web preview. If I then download the file from there it is still, when downloaded to my machine, a pdf. This is not the behavior from before. This is a change in Firefox.

How, when, and why is this change implemented? It seems like a pretty radical change, to coerce one file format to another without any option to get the source file for the user.

Any help is appreciated.

I asked this issue before. https://discourse.mozilla.org/t/cant-login-whatsapp-web-after-early-april-2022-update/97589 It's still continuing.

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I tested a fresh install of firefox. Still can’t get login with the privacy mode. But the normal mode works. When I adjust the settings checking “Do not keep history” and “Clear cookies and website data when closing firefox”. It returned. After a new installation process, I stoped when I checked “Do not keep history” I speculated that this the effect.

But no matter which browser I used, I save no browsing history records. Why only firefox got compatibility problem? Or did whatsapp work anything behind?