Firefox Community Forum

For example, this code in userChrome.css will work for showing a custom favicon on the bookmarks toolbar:

.bookmark-item[label="Bookmark"] image {

   width:0!important;
   height:0!important;
   padding: 0 0 16px 16px !important;
   background:url(custom-icon.png)!important; 
   background-size: 16px !important;

}

However, after a recent update, if the bookmark is located inside a folder, the custom favicon will not be displayed and it will revert to the websites favicon.

See the attached image example of a bookmark on the toolbar vs. inside a folder.

ブラウザゲームサイトUnityroomなどでゲームを遊んでいると、Cookieの容量が10ギガバイトを超えることがよくあります。 どうやら10ギガバイト以上のcookieをFirefoxでは保存できないようです。 FirefoxでのCookieの容量を10ギガバイト以上にしたり、ページごとに個別に管理できるようにしてほしいです。

i used to be able to scroll down in full screen and with the new version i can't and i used to be able to see the queue list and now i can't !!

How can i get the older version cause this one i really don't like

As of yesterday, Oct. 14, 2025, everything in my Firefox Bookmarks and History is gone. This is the message displayed: "The bookmarks and history system will not be functional because one of Firefox's files is in use by another application. Some security software can cause this problem." I have tried to recover them by different suggested means, but it would appear there is NOTHING to recover. Everything in Bookmarks says EMPTY, and I can no longer save any new Bookmarks, it just not allowed. How and why did this happen, and what am I supposed to do? I had hundreds of things Bookmarked, many of them were important to how I run my business, and now are seemingly all gone. This is very upsetting and would appreciate Mozilla getting this straighten out. I need and explanation and resolution.

I can't open https://english.ahram.org.eg and https://gate.ahram.org.eg/ Someone knows why? Maybe it has something to do with the last update. I think I could open them some time ago. Thanks!

https://share.firefox.dev/4n9AQMN

I seem to get really high CPU and memory usage only when I run youtube on Firefox. This issue never happened before. How can I fix this?

Just moved to W11 - initially I had to resolve the bookmarks functional error message - done, but I seem to have a long list of items suggesting many bookmark folders - with items that were just links to sites I had been on - and the original bookmarks folder I had created does not now appear?

Following help on here re bookmarks and history system non functionality - I have renamed files and deleted files such as favicons.sqlite etc etc - but that has not resolved any issues.

Not sure that explains it - hope you can help.

I have attached a snip of my Firefox GUI.

Glaring white backgrounds in webpage GUIs are, simply, a Pain in the Eyes! I like to get rid of them and I have done for the webpage text background you can see in the image. Now, what I would like to be able to do is to set the same colour as the text background in the URL window and the Bookmarks window.

Is this possible? How is it done?

Thanks

Why am I not able to get sound when watching a video while connected to the internet? If I use Chrome or Edge the sound is fine. Could it be an incorrect setting? Or is this a common problem you are already aware of?

I have Firefox set to reopen the previous session whenever the browser is launched. I normally have multiple windows open; I have different tabs in different windows so as to organize them and make it easier to access a particular tab / type of content. I can mouseover on the toolbar and select a tab via preview.

Until recently, whenever Firefox relaunched my previous session, it kept the arrangement of the windows intact (from right to left in the preview). After a recent update, I assume, Firefox is now no keeps them in the same arrangement; aside from my first window, all the others now randomly (or so it seems to me) rearrange themselves whenever the browser launches.

I can reorder them by selectively closing and reopening windows, but it's getting tedious, and the arrangement only lasts for the current session. Once I shut down and restart my computer the windows are, once again, rearranged to no apparent rhyme or reason.

This is getting really frustrating.

hi in a new win 10 instal most text incl Fire Fox text is made up of letters [font] that are made of thin and thick lines [in the same letter]

i dont know if its a strange font or another problem, i have copied all "font" setting from my other pc where i dont have the problem.

also i cant get spell check to work here dsespite turning it on

its very distracting, would be very gratefull for any suggestones if any one can 

help thanks

look, i have no idea if this is a bug, but i have been dealing with this for over a month now. i even have tried to use what was suggested, still does it. it all started AFTER i used mozilla sync, now for some reason it forces me out of my accounts every time i try to restart my browser, forces me to log back into them, then does it again if i close out mozilla at any point after to make sure it isn't about to sign me out another time.

it's getting frustrating because i am tired of losing my history, my bookmarks, and my extensions. this is also reaching a point i am considering changing web browsers because it won't fix after trying the suggestion given before of deleting the files.

I was signed out from my Firefox-Account on my PC for no apparent reason. I reset my Firefox Sync Password today and when I checked my saved passwords they were empty. In my profile folder there is a logins.json.corrupt file which probably contains all my saved passwords. How can I recover them and why doesn't Firefox sync them back like it's supposed to?

Thank you.

I get an error (Sorry, the video player failed to load.(Error Code: 101102))when I try to watch vids on weather network. No problems on other sites (youtube etc.)) Is there a fix for this??

Thank you Rick

woke up after doozing watching a yt video and on my pc i couldn't oppen firefox and it kept crashing so i just booted my pc again

After that i could open firefox but it had a yellow simbol on the three dot setting sections that stated "new tab has downloaded a new component"

i searched online and they said it could be an hijacker i refreshed firefox and run an anlysis with the base windows antivirus

the antivirus say's i'm clean but i still kinda unsure:

  was it really an infection? i ask myself if it could be just a firefox bug i checked extention before refreshing and the only one was 7tv and nothing else

  if it was an hijacker how can i fully know if i'm clean? what better steps can i take?

Firefox repeatedly crashes on my, multiple times a day. I'dc really like to NOT have to change my default browser to Chrome.

What happens is that Firefox freezes, and I get a white bar at the top telling me so. I get a popup box asking if I want to close Firefox or wait for it to respond. Waiting doesn't work, so I always have to close Firefox. When I reopen it, fortunately all m,y open tabs are retained, but it crashes again within minutes or seconds as soon as I click on anything.

There only thing that seems to work is a reboot of my PC. But the respite is short before Firefox crashes again.

I've disabled most plugins, but that hasn't helped. Is there a way to create an event log within Firefox that I can share with someone at Mozilla to help e debug the issue? It's got to be something local rather than Firefox itself; I can't imagine this is happening to most users.

still having spinning circle issue while watching Fox News.

https://www.foxnews.com/world/israeli-hostages-reunited-families-emotional-moments

I am using AdGuard Windows App but the app does not work well with Firefox. There are long page loading delays on many sites (TLS handshakes, etc.) while I do not have this issue with other browsers. I have installed the AdGuard certificate, have disabled DOH in Firefox, but still the problem. The only solution is to turn off HTTPS filtering in the AdGuard Windows app which then defeats many of the protections normally afforded by the AdGuard Windows app. I understand that there is a long history of Firefox not playing well with AdGuard Windows app so I am hoping/wondering if there is some solution on the horizon?