What do you need Flash for? Pretty much every use of Flash has an HTML
fallback these days. That includes YouTube, which hasn't required Flash in
years.
> 1080p htlm5 video on Youtube (Midori will only play 720p)
YouTube doesn't distribute 1080p as a single video file anymore; instead it
distributes the video and audio separately and depends on some JavaScript
code to mux the pieces together, and this requires support for Media Source
Extensions. Firefox and variants of it such as Abrowser can handle this just
fine AFAIK.