an option... Rated 4 out of 5 stars

"shrink to smaller than the search engines title" should have an option...
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Re: Mean it can like v2.0.5 or v2.0.6.
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Re: YES v2.0.7 minwidth(int) Values -1: The searchbar will fit the search engine title.
http://sourceforge.net/p/autosizer/wiki/Preferences

This review is for a previous version of the add-on (2.0.6). 

I don't quite get what you mean. If you set the minimum size to smaller than the size of the search engine title it will become that small. Please note that there is a minimum that firefox will allow us to make the searchbar (approximately 10-15px).

Feel free to open a bug report or feature request so that we can discuss this further. https://sourceforge.net/p/autosizer/tickets/

v2.x Conflict~!!! Rated 1 out of 5 stars

v2.x restart Searchbar conflict with [Tab Mix Lite] and [Super Tab Mode] ~????
Searchbar Autosizer 1.5.7 and Super Tab Mode 1.71, 1.80 conflict...
Searchbar Autosizer 2.0.5(restart) and Tab Mix Lite 4.2 conflict...

This review is for a previous version of the add-on (2.0.5).