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FF started crashing yesterday on certain sites. I upgraded from 48 to 49.0.1 and it hasn't helped.

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Was something else upgraded yesterday that doesn't work with FF, as with the Symantec upgrade a couple of weeks ago? Most sites are okay, but some cites (e.g., Slate.com) crash as soon as I try to go to any links on the main page, and then they crash consistently when I re-try. Win7, FF 49.0.1, no problems until yesterday.

Was something else upgraded yesterday that doesn't work with FF, as with the Symantec upgrade a couple of weeks ago? Most sites are okay, but some cites (e.g., Slate.com) crash as soon as I try to go to any links on the main page, and then they crash consistently when I re-try. Win7, FF 49.0.1, no problems until yesterday.

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Sorry to hear about the crashes. If you are getting the Mozilla Crash Reporter form, your Firefox may have logged some data that would help track down the cause of the problem. You can submit that data to Mozilla and share it with forum volunteers to see whether it points to the solution. Please check the support article "Firefox crashes - asking for support" for steps to get those crash report IDs from the about:crashes page, and then post some of the recent ones here.

Also and/or meanwhile, two suggestions:

Firefox Safe Mode test

This mode temporarily deactivates extensions, hardware acceleration, and some other advanced features of Firefox that might make it more prone to crashing on some systems.

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 less crashy?

Postpone Flash Activation test

While you are troubleshooting this, it might be helpful, to avoid unnecessary pain on sites where Flash is not actually essential, try setting Flash to Click-to-Play ("Ask to Activate"). This will delay Flash from starting on a page until you approve it.

To set "Ask to Activate", open the Add-ons page using either:

  • Ctrl+Shift+a
  • "3-bar" menu button (or Tools menu) > Add-ons

In the left column, click Plugins. On the right side, look for "Shockwave Flash" and change "Always Activate" to "Ask to Activate".

With this setting, when you visit a site that wants to use Flash, you should see a notification icon in the address bar and usually (but not always) one of the following: a link in a black rectangle in the page or an infobar sliding down between the toolbar area and the page.

The plugin notification icon in the address bar typically looks like a small, dark gray Lego block. When the page wants to use a blocked plugin, the icon turns red to alert you to the concern.

If you see a good reason to use Flash, and the site looks trustworthy, you can go ahead and click the notification icon in the address bar to allow Flash. You can trust the site for the time being or permanently.

But some pages use Flash only for tracking or playing ads, so if you don't see an immediate need for Flash, feel free to ignore the notification! It will just sit there in case you want to use it later.

Not a solution if Flash is the problem, but we can come back to that. For example: Adobe Flash plugin has crashed - Prevent it from happening again.