Activation/Deactivation button keeps disappearing. Rated 5 out of 5 stars

This add-on is very good, but what reason the navigation toolbar icon keeps disappearing for? Every time I start Firefox I have to click the "Move" button in the add-on's options. It's very annoying. Version 0.9.4 on Firefox 25.0.1. Thanks.

This review is for a previous version of the add-on (0.9.4.1-signed). 

You are probably using another addon which does not use the api to add its button to the toolbar properly. (eg. Ghostery)
Currently there is not much I can do about it, but with firefox 29 there will be a new api which fixes these problems.