Yep, exactly. I done an extensive test for Gnash and Lightspark recently, to
see how good they're in real life with the following results:
- Gnash (a GameSWF fork) is useful if you want to play non-free flash-based
games, like the Hobo series. It's currently not useful for anything else.
- Lightspark doesn't worked on any website I tested despite going through
many of the popular websites, so it's currently not useful for the end user.
- HTML5 worked surprisingly well, and many videos started to work. No lags,
crashes, or other problems were recognized. Therefore it's the recommended
choice.
I also recommend the UnPlug Firefox extension, which can help in cases where
you will be unable to watch video streams online. In some cases, it finds and
extracts the video link from the page HTML source, therefore allowing you to
download video files for offline playback.