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

• Don't make any changes on the Safe mode start window.
• https://support.mozilla.org/kb/Safe+Mode

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

Cor-el - Resetting to Default seems to have cleaned up the Go-back issue based on trying several sites and within each. However - that has disabled the Firefox 3 theme for Firefox 4+ 2.0.0, and earlier you had suggested using that so I could have the color icons back on the toolbar. If I have to, I'll stick with Default, but it was really nice to have the color icons back. Hopefully, you'll notify browser techs about this.

Can you verify that the Firefox 3 theme is causing the problems by disabling all extensions but enabling and choosing that theme?

You can also try a new test profile with only that theme installed and check the behavior before and after installing and enabling the Firefox 3 theme for Firefox 4+.

If you can confirm that the theme is causing it then try to contact the creator via his website.

Jez's Firefox addons - Firefox 3 theme for Firefox 4+: http://ffaddons.game-point.net/ff3ff4/

Cor-el.. Wanted to let you know that still using theme 3 and removing all add-ons as you suggested, and then enabling each, one at a time, I found the culprit: Autofill Forms 0.9.8.3. I'll look for another app to replace it.

However - now when I click on a Google link and then go back, the link I used no longer is shaded differently to indicate I've used it. Help here, or should I submit a new post? Regards. gw

Does the visited status appear if you open the links in a new tab with a middle-click with the mouse wheel?

Sorry - I've been away.

FYI browser now is working fine even with all the add-ons back on. Go figure.

However, re: the visited status in Google... doesn't matter if I open a link listing in same or new tab, there's no change in the color of the listing when going back to the Google list.