You could try setting the preferences below to the values shown. Enter about:config in the address bar. According to the wiki, the last setting "might cause some websites not be able to play any media, if they request playing from async handlers." These values have been suggested here often, e.g. the thread linked below.

media.autoplay.default = 5 [0:Allowed;1:blocked;5:All Blocked] media.autoplay.block-event.enabled = true media.block-autoplay-until-in-foreground = false media.autoplay.allow-extension-background-pages = false media.autoplay.blocking_policy = 2

https://support.mozilla.org/en-US/questions/1321021

see https://support.mozilla.org/en-US/kb/about-config-editor-firefox

hi t

will try it and let you know if it doesn't work.

thank you for your prompt response ;)

Also did you look here:

https://support.mozilla.org/en-US/kb/block-autoplay

Those two autoplay exceptions are hard-coded and will not affect your data.

Changing media.autoplay.blocking_policy to 2 in about:config will strictly stop autoplay but can stop some videos from playing altogether.

Videos will still download up to the buffer limit even though they don't autoplay. uBlock Origin may help to save data with the "Block media elements larger than X KB" setting.

WARNING from the moderator team: Changing Firefox preferences from the about:config page can sometimes break Firefox or cause strange behavior. You should only do this if you know what you're doing. Please read Firefox Advanced Customization and Configuration Options to learn more.