Page back button is disabled after clicking to another web page, causing me to lose the original page.
When I click to follow a link from one of my home pages, the back button becomes disabled. This has the effect of "disappearing" the first page and "stranding" the link I traveled to.
The only work around is enter the site again. Subsequent clicks from the page don't cause it to disappear again.
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I would suspect a slightly incompatible addon of causing that to happen.
Do you have that problem when running in the Firefox SafeMode?
A troubleshooting mode.
You can open the Firefox 4.0 SafeMode by holding the Shft key when you use the Firefox desktop or Start menu shortcut. Or use the Help menu item, click on Restart with Add-ons Disabled... while Firefox is running.
To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before using the Firefox shortcut to open it again.
If not, see this:
http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+themes