Hi,
auf https://addons.mozilla.org/de/firefox/addon/optimizegoogle/ gibt es eine neue Version von 'OptimizeGoogle' (0.79.1) wo das Problem behoben zu sein scheint.
"==== NOTE ON VERSION 0.79 ====
There was an unexpected issue in version 0.79 which causes redirects to the Google homepage when you try to search. A fix has been submitted and is under review for AMO.
For now, a workaround is to install 0.79.1 or 0.78.2 (see link under "Version Information" at the bottom of the page). If you install 0.78.2 it will automatically update to 0.79.1 when that has been reviewed.
Sorry!"
LG
frankl