On Aug 14th 11 PM ET/Aug 15th 03:00 UTC, due to scheduled Firefox Account server maintenance, users may not be able to sign in or create a new subscription. This is expected to last approximately 30 minutes. Status updates can be found at https://status.vpn.mozilla.org or https://status.relay.firefox.com.

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 to load, slows down during the day

  • 5 replies
  • 1 has this problem
  • Last reply by cor-el

more options

I am running Firefox on Windows 10, and it is slow to start in the mornings, then slows WAAAAY down in the afternoons. I restart with add-ons disabled, but this doesn't help.

I am running Firefox on Windows 10, and it is slow to start in the mornings, then slows WAAAAY down in the afternoons. I restart with add-ons disabled, but this doesn't help.

All Replies (5)

more options


The Refresh feature (called "Reset" in older Firefox versions) can fix many issues by restoring Firefox to its factory default state while saving your bookmarks, history, passwords, cookies, and other essential information.

Note: When you use this feature, you will lose any extensions, toolbar customizations, and some preferences. See the Refresh Firefox - reset add-ons and settings article for more information.

To Refresh Firefox:

  1. Open the Troubleshooting Information page using one of these methods:
    • Click the menu button New Fx Menu, click help Help-29 and select Troubleshooting Information. A new tab containing your troubleshooting information should open.
    • If you're unable to access the Help menu, type about:support in your address bar to bring up the Troubleshooting Information page.
  2. At the top right corner of the page, you should see a button that says "Refresh Firefox" ("Reset Firefox" in older Firefox versions). Click on it.
  3. Firefox will close. After the refresh process is completed, Firefox will show a window with the information that is imported.
  4. Click Finish and Firefox will reopen.

Did this fix the problem? Please report back to us!

Thank you.

more options

No, I've tried and now everything is very slow and choppy. I have to use Firefox for our Box Office program, and I prefer to use it for nearly everything. Right now, it's hard to get much done because all of my programs are so erratic.


more options

go to the Firefox 3 Bar Menu --> Options --> Privacy & Security panel and under Permissions check (put a tick in the box) the setting to Prevent Accessibility Services from accessing your browser.

Monitor in Task Manager. Should stay below 2 gigs. If excessive then do below and monitor and change if need to...Test and go up again , go back down, it will eventually get a zone you and it can live with.

Go to the 3 Bar Menu then Options --> General --> Performance and untick everything. change the recommended size lower then see how it runs. Note: 1 = No Multiprocessor = slow again. Try 2 Restart Firefox after making these changes please.

Note : Hardware Acceleration is for Video Card, Monitor to see if remain off or to turn back on.

Please let us know if this solved your issue or if need further assistance.

more options

I don't even see these in my options menu.

more options

Note that the OP uses Firefox 52 ESR.

Are you using Adblock Plus?

If you use Adblock Plus then you can consider uBlock Origin as a replacement to see if that works better (lower memory footprint).

Did you run Firefox is Safe Mode or only disabled extensions?

You can try to disable hardware acceleration in Firefox.

Close and restart Firefox after modifying the setting to make the change effective.

You can check if there is an update for your graphics display driver and check for hardware acceleration related issues.

There are other things that need attention.

You have multiple Flash plugins.

  • Shockwave Flash 27.0 r0
  • Shockwave Flash 21.0 r0

You can find the installation path of all plugins on the about:plugins page.

You can uninstall the current Flash player version and (re)install the latest Flash version.

See this about uninstalling Flash players:

Note that this will remove all installed Flash players.

You can download the latest Flash player plugin for Firefox on this page.