Be careful with old versions!
These versions are displayed for reference and testing purposes. You should always use the latest version of an add-on.
- Users with the option "Hide tab bar when only one tab open" set along with Full Fullscreen tab bar hiding would have a tab bar with 1 tab made visible on exiting fullscreen (expected behavior is to leave it hidden).
- Opening a new tab while in fullscreen made visible the tab bar regardless of Full Fullscreen "hide tab bar" setting (in some cases it seemed the tab bar disappeared again on its own in a couple seconds, but not always).
Note: the scroll-bar hiding isn't perfect, especially if the site being viewed is messing with the CSS for the scroll-bar. If you see a half-visible scroll-bar after turning the feature on/off, try loading a few more pages (not reloading) or restart the browser.