Seems that the settings are not saved Rated 1 out of 5 stars

The plugin has become unusable as the Firefox address bar now only shows one from the history/bookmarks and then the rest are from Instafox. The behaviour does not change even after adjusting the settings.

This review is for a previous version of the add-on (2.7.9.1-signed). 

Juahan, thank you very much for your bugreport, we just fixed it! I hope this helps, please let me know! :)
https://addons.mozilla.org/en-US/firefox/addon/instantfox/versions/#version-2.8.2 (currently in Mozilla review)

Rated 5 out of 5 stars

Propably the most useful addon there is. I use this everyday all the time! I have no complaints whatsoever.

This review is for a previous version of the add-on (2.7.1.1-signed).