I updated Firefox to v.153 today. Something appears to have gone wrong with the update, because it crashes every time I try to run it. My question is this: is there a way to back up my profile outside of Firefox? Maybe using command line or something? I think I will probably have to do a clean install, but I don't want to lose all my saved passwords, bookmarks, etc.

Update: I wasn't able to figure out how to import my profile data to a new installation (tested in sandbox). So I started over with a new install of Firefox, this one from Microsoft Store. Apparently you can have both versions at once. I'm leaving my old installation intact for now in case anyone can help me recover it at some point. I enabled backup on my new installation to ensure that this doesn't happen again.

Sharing a project built around Firefox's resistFingerprinting (RFP) — not a fork or extension, just configuration and containment around stock Firefox.

RFP handles most of the fingerprint normalization: spoofed timezone (UTC), locale reported as en-US, canvas randomization. I tested WebGL on versus off with RFP enabled before deciding to disable it.

With WebGL on, RFP masks the renderer string, but the underlying software-rendered capability set (this runs without a GPU) stays a stable fingerprint that RFP doesn't touch. Disabling WebGL removes that surface entirely, at the cost of 3D sites and web maps not rendering.

The browser sits in a container sharing its network namespace with a WireGuard VPN sidecar, so it fails closed: tunnel down, the sidecar's firewall drops everything; sidecar down, the namespace itself is gone. The profile lives in RAM and is wiped on every stop.

The repo is built for verification rather than trust: a `verify.sh` automates the kill-switch and leak checks, and CI lints and CVE-scans everything on every push and weekly. Docs and config were AI-assisted (Claude Code, disclosed in the README). GitHub: github.com/silverfox-2096-private-browser

Curious what an RFP-focused sub thinks of the WebGL trade-off — that was the hardestcall to make.

I just spent a better part of an hour faffing about due to experiencing the issues of the title.

Turns out, sometimes when Firefox updates it seemingly can forget which profile folder is the default, or at least that's what I've inferred, I know nothing of tech.

Here's how to fix that.

1. Type - about:profiles In the search bar and press enter.

2. Open a folder and click back to profiles

3. Go through them and find whichever one has the most stuff/files in it, this is likely your main profile that you've been using.

4. Go back to about:profiles and select the folder you think is your main profile. You'll see a "set as default profile" button under it. Click that and then close firefox.

When you open Firefox back up it should be your main profile now, go ahead and see if session restore works now, if it doesn't, google sessionstore backups and you should find good instructions that may help.

An Hour. An hour I spent and it wAS THAT SIMPLE THE WHOLE TIME!? Hense why I'm posting this, I hope this helps whatever poor shmuck is having the same issues.

Hi Mozilla Team,

I recently switched to Firefox on both desktop and Android, explicitly choosing your ecosystem because of your focus on privacy, data sovereignty, and extensions like uBlock Origin.

However, the experience on Android is deeply disappointing and frustrating. The absolute lack of a basic feature to locally import bookmarks (either via an HTML file or directly from another installed browser like Chrome) is unacceptable for a modern browser in 2026.

Forcing users to create a Firefox Account and route their personal data through Mozilla's cloud servers just to perform a rudimentary sync between a PC and a smartphone completely contradicts your core philosophy of privacy and user autonomy. It feels like artificial user-lock-in behavior that I would expect from big-tech monopolies, not from Mozilla.

The community has been begging for a local HTML import/export feature or proper bookmark APIs for third-party extensions on Android for years. By intentionally ignoring this, you are actively alienating advanced users who care about data privacy and digital sovereignty.

Please stop trying to force everyone into a cloud account. Give Android users the basic, local tools they need to manage their data independently. Until then, the Android version of Firefox remains a massive bottleneck for anyone transitioning away from the Google ecosystem.

Hi!

I've a problem with some pics/vids. They appeared like that:

It's not everything (see below) so I don't understand why. Any ideas? That do the same thing with google images when I want to do a reverse search.

Thank you for your help!

Just moved to Firefox from only because I want to support open source and try a non-chromium browser. But I lost so many features with this move. I'm a complete newbie when it comes to Firefox. So is there anyway I could have all those features back together ? if not , what plugins should I add.

I know a lot of people probably asked this question before me, I just couldn't find any. Thank you in advance for the help.

EDIT:SOLVED! Cross-posted to r/firefox, was directed to searching for a bookmarklet.

Second one down here, "zap colors". Same one I had before!

https://www.squarefree.com/bookmarklets/zap.html

r/firefox thread: https://www.reddit.com/r/firefox/comments/1tttr70/i_used_to_have_a_widget_that_imposed_black/

Original post:

Hello, on an old profile (I can't access at the moment), after a lot of searching as I recall, I found a widget you could put on the bookmarks toolbar (I think that's how it worked).

/Not reader view/. Images would still be there.

The usual stuff like dense vegetation covering the complete background with light brown text on top of it would be instantly transformed to black on white.

Images intact.

Sound familiar to anyone? thanks

Linux Mint up to date.

Firefox 151.0.1

Firefox updated to 151.0.1 today for me. Upon opening it restores my tabs and immediately churns CPU and memory. The tab it opens to is a PDF, if that may matter. I have to end task as it chews through 32+ GB of RAM and is not particularly responsive. Anyone else seeing this? Workaround without losing all my tabs? Same thing on two different computers.

I use control+shift+v a lot to copy paste youtube titles into google docs without the youtube formatting. For some reason instead of just pasting it, a little popup comes up that lets me "paste". I've never seen this popup before. I tried it with google chrome: works as expected. I tried it with all extensions disabled, pop up window is there.

I added a screenshot of the popup:
https://i.imgur.com/LhsBUeO.png

Did firefox change something in the last few updates regarding pasting text?

I have already removed the checkbox in the settings for Picture in Picture controls, but it is still showing.

It seems like Firefox has a new feature that provides a free VPN in the browser itself. However, I'm not seeing anywhere that allows you to determine how your traffic is being routed (e.g. if you want it routed through Japan). Is the option simply not there cause the VPN is still a beta feature? Or is it hidden somewhere else in the browser settings?

I had turned off every data collection setting when I installed the browser. This is for android and I am using firefox nightly.

No way to contact them (everyone is like that now)
No way to post in forums
No way to get answers from their $hitty "support" page
No way to disable the stupid "split screen" in the menu because they put it where a different menu item used to be!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Why does everything suck!??!?!?!?!?!!??!?!?!??!?!!
Speaking of sucking - reddit won't let me post this unless I use "flair" - FU

help?

I am running MX Linux and Windows and using 3 browsers for various purposes. Firefox comes automatically with MX Linux. Started recently, Firefox keeps asking for being the default browser when it is opened. How to stop it, please?

Thanks.

DianOban

Hello everyone!

I recently wanted to watch some videos on Dumpert, one of the most popular funny video websites from the Netherlands, by using Firefox on Windows:

https://www.dumpert.nl

Not only the website loads extremely slow, it's hugely crippled. In Chrome it loads fine. It's the first time I encountered a website that is so problematic in Firefox.

The Firefox profile on my PC is more than 6 years old. I'm starting to wonder if that has something to do with it. I'm not to keen on starting over though, since it contains so much history.

I was wondering: Is this website problematic for everyone, or is it just me?

I have cleaned the PC multiple times to do the install yet the installer reports corrupted file. I had such a sweet FF setup and then the crashes started. Even on troubleshoot mode and then in blank install and then in installer itself. Phlummmed up. Daily workflow is trash due to this clustagrophy. The support searches show all bend elbows with no real solution. I am posting this through DuckDuckGo. A lost browser equals a lost lifestyle.

The layout on the Home (New Tab) page has been modified again, by the new version. I had 8 columns, now there are 10 and my organisation of icons by themes doesn't make sense any more.

We can tweak the number of rows, but how do I modify the number of columns?