Screenshot here. It didn't uploaded in first try.

Nightly! So fun! Note that I do not have Nightly, so I can't test this myself.

Try these preferences and see what combination does what you want, or whether we need to look for some others:

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button promising to be careful or accepting the risk.

(2) In the search box above the list, type or paste pict and pause while the list is filtered

I think this is for the toggle control:

(3) Double-click the media.videocontrols.picture-in-picture.video-toggle.enabled preference to switch the value from true to false

I think this is for all PIP functionality:

(4) Double-click the media.videocontrols.picture-in-picture.enabled preference to switch the value from true to false

Apparently PiP is only enabled on Windows.

• 1527925 - Enable user-initiated Picture in Picture for video by default on Nightly for Windows [68]
• https://dxr.mozilla.org/mozilla-central/source/modules/libpref/init/all.js#435

#if defined(NIGHTLY_BUILD) && defined(XP_WIN)
pref("media.videocontrols.picture-in-picture.enabled", true);
pref("media.videocontrols.picture-in-picture.video-toggle.enabled", true);
#else
pref("media.videocontrols.picture-in-picture.enabled", false);
pref("media.videocontrols.picture-in-picture.video-toggle.enabled", false);
#endif
pref("media.videocontrols.picture-in-picture.video-toggle.flyout-enabled", false);
pref("media.videocontrols.picture-in-picture.video-toggle.flyout-wait-ms", 5000);

Yeah, thanks, I tried to disable all those options but no luck.

ArcherX said

Yeah, thanks, I tried to disable all those options but no luck.

Hello ArcherX,

Probably a rhetorical question, but after you changed the values of those prefs, did you then close and restart Firefox in order for the change(s) to take effect  ?

McCoy said

ArcherX said

Yeah, thanks, I tried to disable all those options but no luck.

Hello ArcherX,

Probably a rhetorical question, but after you changed the values of those prefs, did you then close and restart Firefox in order for the change(s) to take effect  ?

Closed... cleared cache and restarted - now it's working, thanks!

ArcherX said

Closed... cleared cache and restarted - now it's working, thanks!

Well done - have a nice weekend  !

jscher2000 said

Nightly! So fun! Note that I do not have Nightly, so I can't test this myself. Try these preferences and see what combination does what you want, or whether we need to look for some others: (1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button promising to be careful or accepting the risk. (2) In the search box above the list, type or paste pict and pause while the list is filtered I think this is for the toggle control: (3) Double-click the media.videocontrols.picture-in-picture.video-toggle.enabled preference to switch the value from true to false I think this is for all PIP functionality: (4) Double-click the media.videocontrols.picture-in-picture.enabled preference to switch the value from true to false

i have 67.0.1 and this PiP is enabled. checking about:config doesn't show "'media.videocontrols.picture-in-picture.enabled".

how to disable PiP then?

@ badbanana :

I just posted in your own thread :

https://support.mozilla.org/en-US/questions/1261415