Nice to see you are still around Pottzie, a lack of Flash is certainly a bother. I tried a few more times to lose my ability to play flash videos but I can't make it stick. Admittedly, I didn't try with Gnome.
However, running a live MATE session, using the Midori browser, without updating packages but after installing Adobe Flash Player with the Rigo application browser, I could again watch cat videos at multiple frames/second.
pottzie wrote: I looked at the Firefox plugins file in /usr/lib/Mozzilla/plugins. It's an empty file, nothing is there. Is that the way it's supposed be?
I don't even have a /usr/lib/mozila folder, although /usr/lib/firefox/plugins does contain/link to my java/flash/totem plugins.
pottzie wrote: And as a final thought, isn't Google supposed to play video without Adobe, with html 5 ? Can't happen fast enough.
I'm not sure whether you mean Google's Youtube or Chrome products, or the Chromium browser.
Youtube can serve some videos in html5, but I find it keeps defaulting back to the Flash player version, even in the sans-advertising videos. It is accessed through the "Try something new!" link at the bottom of Youtube pages.
Chrome usually comes with a built in version of the Adobe Flash Player that auto-updates, but Chrome isn't available to Sabayon yet.
Chromium uses an external Flash Player plugin that usually works fine. Sometimes it conflicts with Nvidia drivers and makes all the videos blue, but you haven't mentioned that yet

As is common to operating systems, it is useful to read installation guides and understand package management before downloading anything. I prefer to update a new system before doing anything else, getting the bug fixes before discovering the bugs.
To get a clear idea of your situation, you can't load any flash objects (ads, games or videos) in either Firefox or Chromium, while both browsers acknowledge the plugin (chrome through chrome://plugins )?