tried this out of curiosity,doesn't seem to work anymore.

Doesn't do anything, but could be related to my adblockers and privacy addons. (◞‸◟)

I have always problem to sign in ... this make me crazy

A big no...
if we are on a page with multiple photos...we cant select each one to post,
so whats the use of this plugin?

inconvenient to use. the window changes to half the screen, or in general it is impossible to hover over it (it is minimized). glitches hard.