Hi
Personally, I prefer to open youtube or other videos with the help of a plug in that opens MPV outside to new moon and basilisk, the quality under Windows XP is much better.
For those who care...
Add-ons to new moon... "open with 6.8.6" to work new moon and basilisk,seamonkey.
Does not work on iceape
https://web.archive.org/web/20191029181104/https://legacycollector.org/firefox-addons/11097/index.html
downloaded the latest version of MPV.exe for windows 7 , 8, 10
https://mpv.io/installation
WARNING: last functional version under xp
xp 32: http://mpv.srsfckn.biz/mpv-i686-20150923.7z
xp 64: http://mpv.srsfckn.biz/mpv-x86_64-20150923.7z
then download youtube-dl.exe
https://github.com/rg3/youtube-dl/releases
or here
https://www.videohelp.com/software/youtube-dl
put youtube-dl.exe and mpv.exe in the same folder and put it wherever you want on your hard drive.
Then go to the "open with 6.8.6" option. and add the path to mpv.exe to the list.
creates a txt file named "mpv.conf". in the same folder as mpv and dl-youtube
added if you want youtube argument lines of the type
--ytdl-format=720p/best
@--ytdl-raw-options=format="bestvideo[height<=?1080]+bestaudio/best"
@ disables the argument line
the argument is used to set the maximum quality of the video, to prevent it from opening a youtube resolution video by default.
indicate in the choices on the right "display as a sub-menu".
in the context menu (right mouse button) you will have "open with mpv". by clicking on any youtube or other video link.
The quality is much better.
You can add VLC a "open with 6.8.6" but it'll only open youtube videos, because it's not attached to "dl-youtube.exe". unlike MPV which will open video links on many websites.
something else I also use "dark bakground and light text" version 0.6.8 for basilisk 52.Does not work on new moon
https://addons.mozilla.org/en-US/firefox/addon/dark-background-light-text/versions/
And to translate texts into different languages, I use "Qtranslate" which uses all the deepl, google bing, baidu yandex... translation engines.
it's much more practical than a browser plug-in
https://quest-app.appspot.com/
Thanks to Roytam1 for his good work