We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Firefox slow on startup

  • 2 majibu
  • 10 wana tatizo hili
  • 10 views
  • Last reply by Melkiah

more options

Hello everyone, i need some help with an issue i've been recently noticing when opening firefox. Whenever i try to open it without any previous tab opened, it takes a long time to start up (~10 seconds). Never had this problem before. After starting up everything works fine and even opening new tabs/windows is done instantly, the issue is experienced only when firefox is closed and needs to start.

I tried disabling my antivirus and the problem persists. I tried disabling hardware acceleration and the problem persists. I tried starting firefox whit a clean, new profile and the problem persists. I tried reinstalling firefox and the problem persists. I tried starting firefox in safe mode and seems to work fine, but when i try to run it normally while disabling all plug-ins and extensions (running default theme) the problem shows up again.

Any idea what else i could try to fix this annoying thing?

Hello everyone, i need some help with an issue i've been recently noticing when opening firefox. Whenever i try to open it without any previous tab opened, it takes a long time to start up (~10 seconds). Never had this problem before. After starting up everything works fine and even opening new tabs/windows is done instantly, the issue is experienced only when firefox is closed and needs to start. I tried disabling my antivirus and the problem persists. I tried disabling hardware acceleration and the problem persists. I tried starting firefox whit a clean, new profile and the problem persists. I tried reinstalling firefox and the problem persists. I tried starting firefox in safe mode and seems to work fine, but when i try to run it normally while disabling all plug-ins and extensions (running default theme) the problem shows up again. Any idea what else i could try to fix this annoying thing?

Chosen solution

Try to boot the computer in Windows Safe Mode with network support (press F8 on the boot screen) as a test to to see if that helps.


In Firefox Safe mode these changes are effective:

  • all extensions are disabled (about:addons)
  • default theme is used (no persona)
  • userChrome.css and userContent.css are ignored (chrome folder)
  • default toolbar layout is used (file: localstore-safe.rdf)
  • Javascript JIT compilers are disabled (prefs: javascript.options.*jit)
    *http://kb.mozillazine.org/about:config
  • hardware acceleration is disabled (Options > Advanced > General)
  • plugins are not affected
  • preferences are not affected
Read this answer in context 👍 2

All Replies (2)

more options

Suluhisho teule

Try to boot the computer in Windows Safe Mode with network support (press F8 on the boot screen) as a test to to see if that helps.


In Firefox Safe mode these changes are effective:

  • all extensions are disabled (about:addons)
  • default theme is used (no persona)
  • userChrome.css and userContent.css are ignored (chrome folder)
  • default toolbar layout is used (file: localstore-safe.rdf)
  • Javascript JIT compilers are disabled (prefs: javascript.options.*jit)
    *http://kb.mozillazine.org/about:config
  • hardware acceleration is disabled (Options > Advanced > General)
  • plugins are not affected
  • preferences are not affected
more options

Thanks for your response, a full list of what is disabled during firefox's safe mode is exactly what i needed.

I double checked everything again and even though it didn't seem like it made any difference the first time, disabling hardware acceleration cuts down my load times to about 2-3 seconds so i'm guessing it's an issue with my (recently updated) video drivers. Think i can call this solved, thanks for the help!