Firefox Community Forum

Error message: the bookmarks and history system will no be functional because one of Firefox's files is in use by another application. Some security software can cause this problem.

I tried following the directions in "learn more" but to no avail. Please help this senior citizen get his bookmarks back! Thank you.

FF ver 140. just loaded and now all my sidebar bookmark fonts are black on black. How do I change the sidebar bookmark font back to white? When I disabled all Themes the white color came back, but enabling any theme and they the font turns black again.

I use an independent password manager to store my passwords and prefer it over Firefox's because it has a highly customizable generator for creating new passwords. However whenever I am on a new site, Firefox pops up with a prompt to generate a secure new password (it appears as a drop-down from the item text box). My password manager also creates a pop up/drop down, but it is hidden behind Firefox's and I cannot access it. I need to be able to disable the secure password generator prompt. Please take a look at my excellently annotated screenshot, attached.

I've been unable to sign in or send messages through certain sites. Put Firefox in troubleshooting mode and everything seems to be working correctly. How can you tell what settings need to be changed to keep it working correctly? Or should I just leave the browser in troubleshooting mode? Thanks. Jim

I tried linking my unlinked profile to my email, I made a typographical error there and when I tried to undo it, Mozilla says this profile is already linked to that email. Mind you, I have not even entered a password or verified that email address yet. I cannot even remove that email from the profile now, even if I do and try to re-sign, the accounts page says I am already synced to the typo email.

Hello! I am an avid user of firefox (especially with adblockers) on a windows 11 PC. Unfortunately, I have recently been experiencing an issue where when I attempt to open firefox, a window will open for a split second before instantly closing again. My PC is up to date, I have tried refreshing firefox and doing a clean install, but cannot seem to overcome the issue, or even open it in safe mode. Does anyone have any advice? Many thanks in advance!

I posted this and was told it was ;posted, but then I got a not found error when I tried to view it, so I'm trying again.

I set a site to use firefox as the default app for ftp not realizing ftp support was removed from the browser. I have been trying to get the dialog back that will allow me to change it. I downloaded filezilla to use for ftp. However, I am unable to get the dialog back that will allow me to change apps.

Can someone help me get the dialog back? And, before anyone suggests it, resetting firerfox to the default settings is not an option.

this is definitely a unique issue i have not ever had, LOL

i'm running into a very strange issue where only the roblox page is not loading properly. everything else seems to work just fine; trying to load roblox on google chrome works fine too! ive turned off my extensions and run it in troubleshoot mode, i've updated the browser and my pc and my drivers, nothing seems to want to fix it. i'm not very sure what's going on. it's very funny, but definitely troublesome- the website is not navigatable in this state.

it randomly popped up like this last night, i was under the impression roblox itself was down because my friend in the call at the time had been talking about how slow the site is. upon digging deeper and asking around, nobody else is having the issue i'm having so i'm lead to believe its a me issue

I am trying to set up a profile however when I click the account icon the profiles menu item does not show up like it says on the manage firefox profiles guide. I am updated to latest firefox version.

The problem that is occurring with Firefox is one website American Airlines, I can not log in to my account with Firefox, however Chrome has no problem logging in. Running Windows 11 up to date Firefox 147.03 64 bit. below is the error message I get Access Denied You don't have permission to access "http://www.aa.com/homePage.do" on this server.

Reference #18.450c3417.1770423478.9f1ea295

https://errors.edgesuite.net/18.450c3417.1770423478.9f1ea295

Thanks for any help. Rick

In May 2025 all browsers should have removed the default styling for the h1 element when it is nested in a sectioning element (article, aside, nav, section). I went into Firefox Dev Editions user-agent style sheet and noticed that the styling for nested h1 elements is still the same. I'm wondering why that is the case, since I was under the impression that all the major browsers had completed make the necessary adjustments at the end of May 2025.

After the most recent update, all of my Firefox tabs, bookmarks, and general UI fonts have gotten larger. Is this intended or a bug? There are not options that I know of to reduce the size of the fonts to how it looked previously either.

Windows 11 Firefox crashed on opening continuously so unable to safe open etc. Did update intel graphics to no avail. Uninstalled in add programs in settings. Did not choose to delete data. Reinstalled and now can't find my profile.