@avi12

hmm...
maybe

so maybe the good idea will be some switch that allows to temporary turn off plugin for specified tab
and also setting "When change quality?" with options: "All pages" and "on-demand"

when there is "all pages" setting turn on then the plugin will change automatically the quality, but I can turn off the plugin for a specified tab
(that is useful when watching only 1 video that I would like to watch with different quality,
e.g. somebody listens to music, and 1 tab using for watch some tutorial)

when it's "on-demand" then the plugin will not change anything, but I can turn on the plugin for that tab
and after each page reload, then quality will be changed
(e.g. when somebody watches a playlist)

before update that plugin was very nice
(at the beggining of each video change quality of video to requested value)
and nothing else so when I change quality at the beggining to e.g. 720p then entire that video was working with that quality

but... new version change quality more often and I need to change that every time
there should be switch "change only at the begging of video"