Right-click options on a web page include 'Save to pocket'. I don't know what that means.
That entry is likely added by one of the extensions (Tools > Add-ons > Extensions).
If you do not know which one then try to disable them all and enable one by one until that entry reappears.
Start Firefox in Safe 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).
Your system details list shows that you use an old Firefox Firefox 9.0.1 version that is no longer supported with security updates.
Any particular reason why you haven't update to the current Firefox 14.0.1 release?
It is important to update to the latest version of Firefox and add-ons to get the latest bug fixes and security updates.
Please Update Firefox to the latest version:
Do you have the Pocket extension listed in "Tools->Add-ons->Extensions" ?