Very nice. Rated 5 out of 5 stars

I like the search engine change it was pretty annoying to have to change it to Google in code itself.

The only thing I do not get is why limit it at 50 max popular group? I upped mine to 200 with zero issues "which is in the fvd_settings.xul"

C:\Users\YOURUSERNAME\AppData\Roaming\Mozilla\Firefox\Profiles\YOURPROFILE\extensions\pavel.sherbakov@gmail.com\chrome\content

I guess it could slow down some older systems, but why not just leave a warning at let people set it to what they choose?

This review is for a previous version of the add-on (4.3.7).  This user has 2 previous reviews of this add-on.