Firefox Support Forum

I noticed during a firmware download with the file extension .DAT that Firefox removed the extension. The file was not recognizable during an attempted firmware upgrade afterward. This is a new issue occurring sometime in the past several months, since last firmware update. Firefox preferences are set to download .DAT files. No other settings are listed for that file extension. I verified the issue points toward Firefox by checking the download with another web browser which completed the download with the extension.

Hello, I have been using Firefox as my main browser for more than a decade. One could say i am some Mozilla fanboy, having convinced many of my friends and relatives to use Firefox instead of any chrome based options (Which there are to many these days). It struck me today, as i was reworking some workflow elements in many programs i use daily, that it is impossible to change any key binding in Firefox anymore. I know it has been a while now, and i searched all over the web for an answer or a solution, but at this point it is clear that other than going in the code and recompiling Firefox manually, it is not possible. I stumbled upon the (only) extension that allows to change some shortcuts, but the two that i wanted to change are impossible to configure from it, being disabling only f12 as i would use it for other things but i do not want to lose the dev console and also ctrl+L to open the address bar, it is quite inconvenient and would much prefer to use ctrl+spacebar as it matches many other bindings i am using with other software. There have been many other features that were changed in the recent years that made me start to look for an alternative, as i see features melting away almost as quickly as the user base of the product.

I do understand that one person's problem is not going to change the way a big piece of software is working, but i am wondering, why are the users losing such features as basic as customizing key bindings in a piece of software that used to be so incredibly customizable in the past? Why is the only viable option to anything chrome based losing it's edge over the competition? Is Firefox v150 be based on the chromium engine or will it die before?

Thank you in advance, and no, i don't need the link to the shortcut page, i already have it.

My current Theme is Dark Fox. But, previously my backgrounds and menus were all white and easy to read. Now for some reason they're black and difficult for me to deal with.

How do I reset to white and sync them on all my devices?

In the last couple of days I cannot log into Twitter in Firefox. I get a message that something is wrong "but don't fret, it is not your fault". When I hit Refresh, it works, but only once. What is wrong? I have the latest Firefox version. Thanks

The present configuration of Bookmarks:

Both "areas" of Bookmarks are linked, deleting from one will update the other. Neither are isolated personal storage areas for selected bookmarks of the user's choosing. You can't keep/delete one bookmark in one area (Bookmarks toolbar and/or hamburger icon > Bookmarks) without the action being correspondingly reflected in the other area.

Now previously I could go to the hamburger Bookmarks, create and delete without my tool bar Bookmarks being effected. Any chance of this happening again please?

I can't open anything in the browser. It always says "secure connection failed" and I cannot reach anything get anywhere within the use of the browser. No matter what I do try. I have looked at a number of workarounds posted online but nothing seems to work. I need some help. I use Windows 10

Hi everybody, I never cleared my browsing history so far, because I often need to know which websites I already visited when I perform a research on Google. Having the previously visited URLs shown in a different colour is useful for my work.

However, I am wondering whether this huge amount of data could affect the browser speed and memory usage. More specifically, I have a few questions:

1) Out of curiosity, in which file of Firefox installation folder the history is saved, and where can I find it? 2) Do you think it is possible to clear ALL the browsing history, except for one specific URL? 3) Could a cluttered browsing history file affect negatively my browser performance?

Many thanks in advance for your help, Elisa

Not sure what happened. I thought I clicked on an update and suddenly Firefox refused to open. I had to re-install Firefox and not sure how to get my preset tabs and history back. I could really use your help as I'm not the most computer literate person and also thanks in advance. Right now everything is in pink, not my fav, to differentiate from what I had before. I deleted my original firefox icon on my taskbar as It would not open or give me internet access.

Since updating to Firefox 102.0, text is not displaying correctly or at all on number of sites, including Gmail and Google.ca. I tried starting FF in Troubleshooting mode, and it solved the problem, but when I went through the steps in the "Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems" article, that didn't fix the issue once I left Troubleshooting mode. I also tried to reinstall Firefox and to refresh Firefox, which I now really regret doing since it didn't solve the issue and my extensions are not working as they did prior to the refresh when I reinstalled them. Wikipedia seems to be displaying text fine, but for many websites the text is just not visible at all. At the moment, I can't even type or paste text into an email...it displays as boxes with numbers in them (not sure what they're called). Oddly, I can see the text in the email preview, but not when I open the email (then it's just blank). Thanks for any help you can provide!

After I open the Firefox browser, a window opens:

We couldn't create the data directory - Microsoft Edge can't read and write to its data directory: C:\ProgramData\McAfee\WebAdvisor\UIHost.exe_pr]S-1-5-21-1684796555-4169006821-2310766321-1005\wa1656781557\EBWebView

Tried to re-intall Edge, does not work, cleared all cookies, etc. Still get this message once I open the Firefox Browser.

Any suggestions how to clear this problem?

I use tabs within windows to keep track of to-do items/wish lists etc. I had about 5 windows open with anywhere from 10-30 tabs each, my firefox closed unexpectedly and did not give me the option to recover the windows and tabs as it has before. Any way I can recover these or am I screwed? Thanks.

Firefox V102(64) Win10 Hardware Acceleration off. Freezes sometimes after several hours, sometimes after 5 minutes even while one tab is working, no other tabs work. Task Manager to turn off Firefox. Main tabs https://www.kadaza.com, Fox News, YouTube, and business websites. Sometimes ESPN.

Lastest update did not fix.

When I try to change the message of a super thanks donation in Firefox on Linux it's not possible. On the other hand when I try the same thing on Chromium it's totally possible so I wonder why that is happening.

I suddenly can't click the "copy song link" item in Spotify anymore. It worked fine last week and works normally in Chrome.

It also fails in Troubleshoot Mode and after clearing Startup Cache.

Firefox 102.0 (64 bit) on Windows 10

Whenever I try to full screen a video the first time I open the browser, the video will not completely fill the screen. It only happens on firefox and the first time I open the browser. I thought it was my extensions but it was not that. A thread was created on reddit describing the problem I have. I have linked it here. https://www.reddit.com/r/firefox/comments/rhwuvz/firefox_full_screen_on_win11_always_leaves_some/ I tried to change themes and that also did not work. Not sure what the problem is. Please help.

I'm viewing a webpage that has several links. When printing the webpage to pdf using Firefox, the links magically display their full URLs, blocking the contents of the page. How can this be prevented? This does not happen when using MS Edge. Please see the attached screenshot. The top image is from a pdf printed using Firefox, and the bottom is from a pdf printed using MS Edge. 91.8.0esr (64-bit)

I've downloaded the browser and not after an hour it stops working and wont decide to open anymore, i've tried solutions on youtube for example "Firefox.exe -p" or "Ipconfig" I dont know what to do is it possible it can be resolved?