There are a few options you can still try:
https://trisquel.info/en/wiki/play-videos-without-using-flash
- Re: [Trisquel-users] Looking for help with Abrowser flash fil... davesamcdxv
- Re: [Trisquel-users] Looking for help with Abrowser flash fil... nicolasmaia
- Re: [Trisquel-users] Looking for help with Abrowser flash fil... davesamcdxv
- Re: [Trisquel-users] Looking for help with Abrowser flash fil... catfishagain
- Re: [Trisquel-users] Looking for help with Abrowser flash fil... martin