Have been having issues with firefox crashing & v e r r y s l o w also sluggish, I removed by the programs & features than redownloaded it, I can not use it.
Had to remove it for the last & final time. I love & miss my Firefox, but can't take the chance of someone getting into my system. The upgrade had yahoo toolbar which is always easy to get rid of (thank God) but I have this yellow sign in my popup that says something about the system not being safe, & we can not go to any web sites. Why is it everything that is upgraded always turns out to be BULL. I can not use Firefox for anything, so once again had to remove it using the programs & features update/remove. Windows7 Home Premium 64-bit Operating System. HELP.
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Mozilla doesn't supply the Yahoo Toolbar with Firefox downloads. Where did you download Firefox from?
From here . . . https://www.mozilla.org/en-US
The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your bookmarks, history, passwords, cookies, and other essential information.
Note: After resetting Firefox, you will lose any extensions, toolbar customizations, and some preferences. See the Refresh Firefox - reset add-ons and settings article for more information.
To Reset Firefox:
- Open the Troubleshooting Information page using one of these methods:
- Click the menu button
, click help 
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.
- Click the menu button
- At the top right corner of the page, you should see a button that says "Reset Firefox" that looks like this:
. Click on it.
- Firefox will close and reset. After it is done, Firefox will show a window with the information that is imported.
- Click Finish and Firefox will reopen.
Did this fix the problem? Please report back to us!
In the address bar, type about:crashes. Note: If any reports do not have BP in front of the numbers, click it and select Submit.
Using your mouse, mark the most resent 7 - 10 crash reports, and copy them. Now go to the reply box below and paste them in.
You can try to disable hardware acceleration in Firefox.
- Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
You need to close and restart Firefox after toggling this setting.