I've tried this feature, butMost of the time, hovering a link and pressing Alt+Shift does nothingThe font size is ridiculously largeThe bubble could use a close buttonThe "key points" section is often missingWhen it's there it's often nonsensicalThe ...
FWIW, Arc Search also works this way, as does desktop Safari.When you get used to it, the lack of such tab-closing behaviour in other browsers is quite annoying.I would be happy if it was optional (off by default) in Firefox.
