Search Support

Beware of phishing attacks: Mozilla will never ask you to call a number or visit a non-Mozilla website. Please ignore such requests.

Learn More

Cuireadh an snáithe seo sa chartlann. Cuir ceist nua má tá cabhair uait.

Firefox slow and laggy after updating to Firefox 51

  • 7 bhfreagra
  • 5 leis an bhfadhb seo
  • 36 views
  • Freagra is déanaí ó cor-el

more options

Hello, I have yet another problem to talk about. Today, I updated from Firefox 50.1 to Firefox 51. It's been really slow and buggy ever since. Can anyone help me on the issue? I would really appreciated it.

All Replies (7)

more options

Start Firefox in Safe Mode {web Link} by holding down the <Shift>
(Mac=Options)
key, and then starting Firefox. A small dialog should appear. Click Start In Safe Mode (not Refresh).

Is the problem still there?


https://support.mozilla.org/en-US/kb/firefox-slow-how-make-it-faster

https://support.mozilla.org/en-US/kb/firefox-uses-too-many-cpu-resources-how-fix

https://support.mozilla.org/en-US/kb/firefox-hangs-or-not-responding

more options

Hello Fred, this problem happens if I use Firefox for an hour. I don't think Safe Mode would help. Even with a "faulty" RAM, Firefox 50.1 ran very smoothly with sometimes minor problems. This issue started happening after updating.

more options

Don't do this until you are sure. I called for more help.

Install an older version of Firefox {web link} 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.

more options

FredMcD said

Don't do this until you are sure. I called for more help. Install an older version of Firefox {web link} 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.

Thanks. I'll try that tomorrow.

more options

Fred, just to give you an update, I found the root cause of the problem. It was because firefox.exe duplicated. I tried closing the one that was eating up all the memory and I got "Bad news first: This tab has crashed".

more options

More than one process is normal for the current Firefox. http://www.ghacks.net/2016/07/22/multi-process-firefox/

Multi-process Firefox is codenamed "e10s". https://wiki.mozilla.org/Firefox/multiprocess

more options

Try to disable multi-process tabs in Firefox.

You can disable multi-process tabs in Firefox by setting the related prefs to false on the about:config page.

  • browser.tabs.remote.autostart = false
  • browser.tabs.remote.autostart.2 = false