Were the three recent crashes all on one site? When you have a problem with one particular site, a good "first thing to try" is clearing your Firefox cache and deleting your saved cookies for the site.

1. Clear Firefox's Cache

orange Firefox button or Tools menu > Options > Advanced

On the Network mini-tab > Offline Storage : "Clear Now"

2. If needed, delete the site's cookies here

While viewing a page on the site, right-click and choose View Page Info > Security > "View Cookies"

Then try reloading the page. Does that help?

Sometimes after an update add-ons create new conflicts. A standard diagnostic for that is to try Firefox's Safe Mode.

First, I recommend backing up your Firefox settings in case something goes wrong. See Back up and restore information in Firefox profiles. (You can copy your entire Firefox profile folder somewhere outside of the Mozilla folder.)

Next, restart Firefox in Firefox's Diagnose Firefox issues using Troubleshoot Mode using

Help > Restart with Add-ons Disabled

In the Safe Mode dialog, do not check any boxes, just click "Continue in Safe Mode."

If the site works without crashing, this points to one of your add-ons or custom setting as the problem.

Any luck?

Finally, if the problem page uses Flash, check out this new support article: Flash 11.3 doesn't load video in Firefox.

You can also try to reset Firefox.

• https://support.mozilla.org/kb/reset-firefox-easily-fix-most-problems

Also make sure that you have the latest driver for your graphics display card and have updated all plugins.

• https://support.mozilla.org/kb/how-do-i-upgrade-my-graphics-drivers

• https://support.mozilla.org/kb/Troubleshooting+plugins