Firefox Support Forum

Hi. Randomly, but very often, I cannot drag and drop move tabs. Other moving (p.e. "move to beginning") does work. After restart of Firefox, it works again - till it randomly does not.

Current Firefox (126.0) Kubuntu Installed via Snap

I always had one version of Firefox installed. I regularly update the software via Help >> About Still, after every update, I am getting multiple versions of Firefox listed at [Settings/Installed Apps] and [Control Panel/Uninstall or remove apps] on my Win11 23H2 22631.3593 (screenshot attached).

In order to get rid of outdated items from the list, I need to reinstall Firefox completely, but the same thing is happening with every update of Firefox.

Is there a way to resolve this and why is this happening?

control + UP (arrow) is documented to "go to top of page". That has broken as of 126.0 And, for some reason I don't remember, I found that using "HOME" in the past was also problematic.

How do I report something as "b roken" to firefox and do you agree it is broken?

I want to transfer all my bookmarks to another pc. I select export to HTML file and save to a flash drive. I insert the flash drive into the second pc then select 'import and backup' and 'import bookmark from HTML' . Then select the Bookmark.HTML on the flash drive and 'Open'. But no bookmarks ever appear anywhere that I can find. How can I get the bookmarks?

As title- Cannot download for example webm format, but jpg is okay. cannot install any addon, theme or anything. DRM didnt install as well. i was trying reinstall, refreshing browser, rebooting.

I have recently been getting an error message when I open Firefox saying "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". This has been happening since I clicked on a mail in Mail to unsubscribe from a spam/phishing mail list, which seemed to result in me installing Firefox Private Browsing, which I had never subscribed to. I have tried uninstalling Private Browsing but there is no way of doing that. I have even uninstalled and then re-installed Firefox completely but I still have the same problem. Because of the problem I have now lost all my bookmarks and history, and am unable to create new bookmarks and history. I have been on the help forums and seen that I can Disable Private Browsing by going through my anti-virus (Avast), which I have not yet tried because what I would really like to achieve is uninstalling and not having Private Browsing on my Start menu, rather than simply disabling it. Anyway, would disabling it solve the bookmarks and history problem ? Can anyone give me the solution ? Thanks. As you may gather, I am not very techno so you would have to give me the idiot's version of any instructions or advice.

I restarted my Windows 11 laptop and got error message about user profile. Restarted again and looks like it was corrupted so deleted my my user profile and Firefox config and bookmarks are gone!

Still have all the files just a new user profile and the old one is gone?

Any help how to get Firefox bookmarks back would be much appreciated

Hello, I've chatted with the creators of the add on "Twitter X Ad Blocker" and asked why it isn't working any more. They told me they have an update made and ready but you have not approved it yet. What will it take to get you to approve the update so this will work again?

Thanks, Tracy

After up grading to a Mac Studio running Os 14.5, I downloaded the latest Firefox 126.0. I have three other computers with Firefox. The oldest a Mac Pro running 10.13.6 Hi Sierra that works flawlessly. I tried sync and bookmarks came over to the Mac Studio but not any passwords. I tried importing via a .csv file and got the message: Import complete New passwords added: 0 Existing entries updated: 0 Duplicate entries found: 0 Errors 190 (not imported)

Firefox will NOT even save manually entered passwords. I suspect some problem with Sonoma's paranoid security but I cannot find a solution. Any suggestions?

Hello, I have problem with firefox. When I try download from facebook page files .docx, .xlsx (Microsoft Office) Firefox automatically download it as PDF and file is broken. I don't know how to repair this. Please help, it is very frustrating.

Since the latest update, when I right-click on a bookmark or an item in the history list (from the menu or the bookmarks toolbar), I still get the menu that has items like "Open in new tab" or "Edit Bookmark".

However, the focus for the mouse stays on the previous menu, so that I can't click on anything in the "right-click menu", instead it is interpreted as a click in some random item in the previous menu.

Going into troubleshoot mode didn't help, so I don't think it's my configuration causing this.

Please help me to understand why I keep getting the 'Gah! Your tab just crashed' message. This only started a couple of weeks ago, but is extremely annoying and makes me doubt the integrity of Firefox. The problem can be circumvented (at least for a while) by closing and re-opening Firefox, but I'd prefer not to have to keep doing this.

for example: discord.com => discord.com/app

Is there any better way than adding a bookmark for it?

Hi,

So I got a new ultra-ultra wide 32:9 monitor and I noticed when I have firefox maximized on my new monitor and switch focus to a different window all of the text on tabs on the full screened firefox would go very blurry. If I had the same firefox windows full sized on my 16:9 secondary monitor this didn't happen. I then tried having the windows not maximized on the new monitor and it did not do this behavior when it was occupying what I would say was 1/3 of the screen width but if I stretched the screen too far it would again go back to this blurry behavior. So it seems like the text for the tabs behaves differently after the firefox window is stretched to a certain width. On the non-stretched firefox windows the letters simply get darker which I find to look better than the blurring. I added a screenshot that shows the differences I am seeing, the firefox window on the bottom screen shows the blurring, if you look at what would be the left middle side of the screenshot, while the top and bottom middle firefox windows show what it seems like it should look like.

Thanks, Dan

Hello! I installed Firefox about a year ago, and for the entire duration it seems about 60% of the time the default fonts on various websites look weird (bold?). I have tried uninstalling/reinstalling Firefox, clearing the cache, etc. See attached images for examples. Help!

I'm trying to load a jsonlz4 backup of 88.4 mb with 1 146 851 items. When creating a new places.sqlite, the majority of the bookmarks inside Other Bookmarks don't have a location url. Like this:

Name_____________| Location

Normal bookmark | site.com My problem_______|

I tried using https://www.jeffersonscher.com/ffu/bookbackreader.html to convert it into html and json. Importing the html into firefox puts everything into the Bookmarks Menu and everything is missing their location url. Opening the html in writer I see that every bookmark does have its location url but as hyperlinks on the names. Restoring the json, 1 time after not clicking the Check/Repair JSON button and another time after clicking it, gives me all the bookmarks in their correct place but the majority are still missing their location urls.

I also tried creating another places.sqlite with my jsonlz4 backup and exporting as html and json through the bookmarks Library. Importing them, separately, into new firefox profiles just gives me the bookmarks that weren't missing links.

Also tried creating a places.sqlite in windows but it stopped before the Other Bookmarks folder, I guess.

I don't know if its relevant but between restarts and shutdows I always have 18 kmozillahelper processes before even starting firefox. I don't know since when they haven been there or if they have increased.

Any ideas on how to restore correcly my bookmarks?

tl:dr Here's the CSS to put in userChrome.css file. This is the "hides everything" option. See toward the end of this post for others.

1. navigator-toolbox:has(#PersonalToolbar[collapsed="true"]) {

 visibility: collapse;

}

+++

I was looking for a way to hide the nav bar and ran across this older forum topic (https://support.mozilla.org/en-US/questions/1288181).

The solution shown here seems to be non-functional these days (early 2024), but it gets us in the right direction, so below is the code for us to look at.

1. main-window[chromehidden*="toolbar"] #nav-bar {

 visibility: collapse;

}

This is CSS, meant to be copied into a text document, itself placed in a folder called "chrome" that you'll need to create in your browser's active profile folder. Per step 6 in the instructions (https://www.userchrome.org/how-create-userchrome-css.html) linked by @jscher2000 in the above-linked forum topic, you'll also need to set toolkit.legacyUserProfileCustomizations.stylesheets to "true" in about:config. If you don't know what about:config is, this is a good example to get started, but I'm not going to explain it here.

This CSS code selects the object with ID #main-window, with an HTML attribute "chromehidden" equal to "toolbar", and sets its CSS property "visibility" to "collapse". Apparently Mozila have changed the way they implement toolbar hiding, as this no longer works — this chromehidden attribute is nowhere to be found in the HTML that drives the Firefox interface, not sure if that's the place to look for it, but I think so. Anyway, we need to dig around in this interface HTML ourselves to see what changes when hiding the bookmarks toolbar, so we can adapt a new method to what's going on in the browser now.

To do so, we open a window within a window (chrome://browser/content/browser.xhtml) and run the inspector via Web Developer Tools. Comparing the HTML we see here with the bookmarks toolbar in each state (I used BBEdit to compare the texts), we see that the object with ID #PersonalToolbar experiences a change in its "collapsed" attribute when we hide/show the bookmarks toolbar. So in our CSS code, we shift our strategy to update the "collapse" CSS property for #navigator-toolbox whenever it contains a #PersonalToolbar object with its own "collapsed" attribute set to "true", which occurs whenever we hide the bookmarks toolbar. Somewhat surprisingly, this approach of updating the CSS property seems to auto-reset on its own when the "collapsed" attribute is set back to "false", which occurs when we show the bookmarks toolbar again. In other words, it simply toggles with the visibility setting of the bookmarks toolbar, and we don't have to write any further code.

If you're interested in hiding some other UI element when hiding the bookmarks toolbar, you can modify this code to do stuff like that (but to go beyond the below examples you'll need to suss out the object IDs, CSS properties, and HTML attributes — and maybe more, depending on what you're trying to do — on your own).

But for convenience, here's an example that hides just the tabs:

1. navigator-toolbox:has(#PersonalToolbar[collapsed="true"]) #titlebar {

 visibility: collapse;

}

Here's one that hides just the URL bar:

1. navigator-toolbox:has(#PersonalToolbar[collapsed="true"]) #nav-bar {

 visibility: collapse;

}

Since those are the only other two things in the #navigator-toolbox to be hidden, I suppose that means we now have all options on the table (at least the way I have the browser set up). Enjoy!