Firefox: Popout Player Window is Wrong Size

[rthaut]

In Firefox the popout player window is never opened at the correct size, regardless of configuration.

I thought this was just an issue when using percentage-based custom dimensions, but it occurs even when configured to use the original video player's size.

It seems to be using some default/fallback window size, as determined either by Firefox or the Operating System.

[rthaut]

This is caused by setting privacy.resistFingerprinting to true, although I haven't (yet) found proper documentation of this behavior anywhere.

It appears that enabling privacy.resistFingerprinting prevents windows.create() from actually using the supplied width and height properties (although curiously windows.update() does appear to use them).

Ideally it would be nice to detect this somehow (or detect the resulting incorrect functionality) and display a warning to the user, perhaps on the Options page and/or as a browser notification.

For now this should at least be documented on the Project Page as a FAQ and/or on the Options documentation page.