Prohledat stránky podpory

Vyhněte se podvodům. Za účelem poskytnutí podpory vás nikdy nežádáme, abyste zavolali nebo poslali SMS na nějaké telefonní číslo nebo abyste sdělili své osobní údaje. Jakékoliv podezřelé chování nám prosím nahlaste pomocí odkazu „Nahlásit zneužití“.

Learn More

Firefox has a serious problem on its hands

more options

Ever since it upgraded to V54 Firefox has developed a cascade of problems one right after the other. In one day the following occurred.

1. Bookmarks could not be imported from HTML file 2. Firefox won't boot up or if it does it gets stuck and often never finishes loading. 3. web pages load much slower than normal. 4. Online games won't play well 5. Lag time develops when typing and switching web pages 6. web pages don't load well (jerky) 7. Operations on web pages very slow to function or sometimes don't. 8. YouTube buffers a lot 9. In general it feels like you are on a 1meg internet line with insufficient ram.

My serious suggestion is to roll back all the upgrades to say V51 or 52 to where it was stable and pull all the other upgrades off line until you can properly sort out the problems. Failure to do so will mean people will move to another browser. Nobody is going to put up with this sort of poor performance for long. I don't even like to click the icon for fear it either won't load or will take forever to load. FF used to perform flawlessly. Now its a joke. Can you say hello Opera. I don't have time to waste on a broken browser.

Ever since it upgraded to V54 Firefox has developed a cascade of problems one right after the other. In one day the following occurred. 1. Bookmarks could not be imported from HTML file 2. Firefox won't boot up or if it does it gets stuck and often never finishes loading. 3. web pages load much slower than normal. 4. Online games won't play well 5. Lag time develops when typing and switching web pages 6. web pages don't load well (jerky) 7. Operations on web pages very slow to function or sometimes don't. 8. YouTube buffers a lot 9. In general it feels like you are on a 1meg internet line with insufficient ram. My serious suggestion is to roll back all the upgrades to say V51 or 52 to where it was stable and pull all the other upgrades off line until you can properly sort out the problems. Failure to do so will mean people will move to another browser. Nobody is going to put up with this sort of poor performance for long. I don't even like to click the icon for fear it either won't load or will take forever to load. FF used to perform flawlessly. Now its a joke. Can you say hello Opera. I don't have time to waste on a broken browser.

Všechny odpovědi (2)

more options

Antares4s said

Ever since it upgraded to V54 Firefox has developed

Is this when you upgraded to v54 or v55?

Note: V55 has been giving users problems. Reinstall v54.

https://support.mozilla.org/en-US/kb/install-older-version-of-firefox?cache=no Be sure to read everything here.

If you still want to downgrade, look under; I still want to downgrade. Click the Directory of other versions and languages link. Look for the directory of the version that you want. But, remember that old versions may have security issues.

You should also check out Firefox; Extended Support Release https://www.mozilla.org/en-US/firefox/organizations/ https://www.mozilla.org/en-US/firefox/organizations/notes/ https://www.mozilla.org/en-US/firefox/organizations/system-requirements/

more options

Did you ever test in Firefox's Safe Mode? In Safe Mode, Firefox temporarily deactivates extensions, hardware acceleration, and some other advanced features to help you assess whether these are causing the problem.

If Firefox is not running: Hold down the Shift key when starting Firefox.

If Firefox is running: You can restart Firefox in Safe Mode using either:

  • "3-bar" menu button > "?" button > Restart with Add-ons Disabled
  • Help menu > Restart with Add-ons Disabled

and OK the restart.

Both scenarios: A small dialog should appear. Click "Start in Safe Mode" (not Refresh).

Any improvement? (More info: Diagnose Firefox issues using Troubleshoot Mode)


If you like, you can switch to the ESR (Extended Support Release) track, which is based on Firefox 52. ESR was first developed to meet the needs of large organizations that wanted Firefox to change much more slowly, but anyone can run it.

Certain files up-converted by the Firefox 55 installer will not work in earlier versions. I have not seen a definitive list of what those are, or how earlier releases of Firefox cope with the changed files. The rest of the info is in Fred's post.