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I tried all common troubleshooting steps: deleting cache reinstalling different settings turning off adblocker/vpn disabled efficiency in task manager and set it permanently to off in FF

I used to have 1000+ tabs in 2016 no issue. I had problem in past with Firefox using 100% CPU which now it is not using only like 50, but memory is getting full 89% i use also large page file on ssd. Problem is even when i restart firefox it is slow with low RAM usage! SO that's not it! Even 5 tabs sometimes it is slow!

It is so damn slow it drives me crazy! I tried also Quantum in past when Firefox has 100% CPU usage bug and it was only tiny bit better but still caused 100% CPU usage!

All other browsers are anti user cannot even stop Autoplay literal terrorist Firefox is only normal browser unfortunately performance compare to 2016 got absolutely abysmal! I had this problem even in-between reinstals of OS so it doesn't seem it is me. I play demanding games no issues on my PC...

Attempted to do an Firefox update more than a month ago on my HP (microsoft windows) computer. Everytime I open my computer I gt the Firefox Crash Reporter Window. When I hit the Quit firefox box it submits the crash report and then I X out the box. I cannot use Firefox as a browser. The DISASTER is that I CANNOT open any files previously downloaded while using Firefox (eg PDF files). I get the crash report box. I NEED these files!

Please HELP!

After installing v133.0.3 of Firefox for Mac, I can no longer log in to my ASUS router. Were there security changes behind the scenes that could have caused this failure? I can still connect to my router using Safari and all other connections work fine.

Thanks in advance for your thoughts and suggestions.

This has been a problem for me for a very long time, and I'm tired of having to use Chrome every time there's an update to Firefox.

The issue I have is that I will get the notification saying there's an update. I click the button to update now, the browser opens the auto download page and I get a not secure connection warning. The only work around I've found is to use Chrome, and sometimes I can use the "Other downloads" option.

I'm not running a VPN, or any other networking software on my pc. This is for the full program, not the Windows Store app.

Secure Connection Failed

An error occurred during a connection to download.mozilla.org. The server uses key pinning (HPKP) but no trusted certificate chain could be constructed that matches the pinset. Key pinning violations cannot be overridden.

Error code: MOZILLA_PKIX_ERROR_KEY_PINNING_FAILURE

   The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
   Please contact the website owners to inform them of this problem.

My home setup is such that I use PiHole for DNS (dual PiHoles). This includes doing DNS for my local network as well as black-hole for a bunch of Ad-serving domains. To get this to work with Firefox, I've gone through all the settings to turn off DNS over HTTPS (DoH). The documentation on this is in a multitude of places, and seems to have a lot of "this setting doesn't exist anymore" pointers, but I get it working... sort of.

Every few months (maybe every time Firefox updates?) Firefox stops seeing my local network names and starts showing ALL THE ADS. I go back through and LOOK AT THE SETTINGS (which ARE still set), but after LOOKING at the settings, it starts working as expected again for another however long. This has come to the point where I've stopped bothering to open Firefox when I need to get to my own network resources. DoH is already hard enough to turn off, but having to look it up every few months to "check" the settings so it's REALLY off is very difficult.

This has been going on for at least 8 months, and I'm only bothering to mention it now because I've noticed that I'm changing my habits, Goocrosoftle is winning.

So, MAYBE I'm still missing something. Half the articles point to settings that don't exist anymore, so maybe there's one more thing that will make this actually stick. Everything leading to the search HERE on this topic talks as if Firefox is still using the local machine's DNS, and that has not been the default for quite some time. Either way just adding my "inside." domain to the localdomains setting will not fix this problem.

Since I updated my MacBook to macOS Sequoia, I have no access to local network pages (except 127.0.0.1, localhost and 192.168.0.1) - an "Unable to connect" error appears. Immediately after the first launch of Firefox, a request for local network permissions appeared, which I accepted, but it didn't help. I performed all the actions from this article, and also used the terminal command reset All approval status for org.mozilla.firefox and Firefox disappeared from the privacy settings. While a request for access to the microphone and camera reappeared after restarting the browser, no question about the local network appeared. The problem only occurs in Firefox (version 128.5.2esr) and does not appear in other browsers (checked in: Firefox Developer Edition, Firefox Nightly, Safari and Google Chrome). macOS 15.1.1 (24B91).

I received a notification that i could not connect to the internet without logging in. I tried the remedy suggested by other users (2020) and succeeded in removing this notification but still cannot access internet from my Mac computer. I have been a mozilla user for many years and have not encountered this oroblem before. All my other devices are working.

When I open Firefox it opens a maximized window with tabs, then it opens a minimized with a single tab, then it reopens a maximized window with all session tabs. Each window displays in succession, one window at a time.

I'm on desktop using Windows 11.

I just read a post saying this behavior was caused by the resist fingerprinting feature. Can someone explain how that causes the repeated opening of browser window 3 times. Is there a way to retain the anti-fingerprinting behavior w/o the multiple window opening behavior?

I like firefox...used it two to three times a week for over ten years...Now when I click on the icon on my menu, I am greeted by the ansurb: "That doesn't look right." When I try to download Firefox, it will not down load...why are you idiots doing this to your own product?

Subject: Assistance Required for Frequent Firefox Crashes on Ubuntu

Dear Developer Team,

I am facing persistent issues with Firefox crashing on my Ubuntu PC, and the problem has been ongoing for the past 40–50 days. Despite multiple attempts at troubleshooting—including uninstalling and reinstalling Firefox, clearing all caches, and other measures—the issue remains unresolved.

I’ve noticed that Firefox works for a few days after reinstallation, but then problems begin to surface, such as a half-screen display. Eventually, after restarting the PC, the browser starts crashing again.

Could you please investigate this matter urgently and provide a resolution? Additionally, I would appreciate it if you could clarify whether this might be related to a RAM issue or some other underlying cause.

Looking forward to your assistance.

Best regards, zimmi