A few weeks ago, Google said that they would be discontinuing Google Toolbar for Firefox 5 and will only continue supporting Firefox 4. However, in spite of that, the Google Toolbar continues to work in Firefox 5 and Firefox 6.
I have been using the Google Toolbar in Firefox 5 and Firefox 6 for a few months now without issues, however, it does come with a caveat. Since Google has officially said that support for Google Toolbar is only available through Firefox 4, Firefox automatically disables the add-on on Firefox 5 and Firefox 5.
Also Read: Firefox 5 Review | Firefox 6 Review
In order to enable the Google Toolbar in Firefox 5 and Firefox 6 you will first have to install the Add-on compatibility reporter extension in Firefox and restart the browser.
Once you have done that head over to the “Add-ons” and you will be able to run Google Toolbar in Firefox 5 and Firefox 6. Firefox will still report that the add-on is incompatible with the newer versions, however, you can continue using it without issues. If you need more help with this read our earlier guide on How To Run Older Add-ons in Firefox.