Works nice but.. Rated 5 out of 5 stars

having an issue with the browser icon which disappears suddenly so I can't turn on / turn off flash.

Update: Klemens, Thanks for the kind reply and its working fine now.

This review is for a previous version of the add-on (0.8.4). 

Do you mean that the icon of the addon is disappearing? Does it disappear after you've done anything like for example closing a tab or window?
Can you re-add it using the toolbar customisation? (http://support.mozilla.org/en-US/kb/customize-firefox-controls-buttons-and-toolbars)