Can you attach a screenshot?

• http://en.wikipedia.org/wiki/Screenshot
• https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem

Use a compressed image type like PNG or JPG to save the screenshot.

Is that the button for the social features?

• http://blog.mozilla.org/labs/2012/03/experimenting-with-social-features-in-firefox/

You can check the value of the social.enabled pref on the about:config page to make sure that it is set to false.

• http://kb.mozillazine.org/about:config

Here it is!!! Thank you so much!

Yes, that looks like the button to access the social features that I posted above.

Did you check the social.enabled pref on the about:config page?

Thank you! In about.config, the "social.enabled" is set to false already. What should I do next?

Try to drag that button back into the toolbar palette.

• http://kb.mozillazine.org/Toolbar_customization

You can also check for problems with the localstore.rdf file.

• http://kb.mozillazine.org/Corrupt_localstore.rdf

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).

• Do not click the Reset button on the Safe mode start window or otherwise make changes.

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes