Be careful with old versions!
These versions are displayed for reference and testing purposes. You should always use the latest version of an add-on.
Added hidden option you can get to through about:config
set to true and notifications won't come back on tab change.
I haven't done much testing on the new notification code.
I recommend setting that string to 6 or 7
reset the entry to go back to checking for the actual version of Firefox you are using. This can create problems if you are not using Add-on Compatibility Reporter or setting Firefox so you can install incompatible add-ons, otherwise they will install, but be immediately disabled since they are not compatible.