Wanted to complain there's no Firefox version but then found it myself here: https://addons.mozilla.org/en-US/firefox/addon/betterviewer/

Looks pretty feature complete. Had just a small problem where there was a small icon with three dots to right, probably supposed to show more icons, but then doing nothing.

Also, the icon list would profit from grouping, meaning some distance between groups of different icons. Especially, put the icon to switch to "turn off" the extension far away from the others.

Oh, and please add an option to increase the toolbar buttons to at least 4x their current size. Some of us are ... getting old.