@ch0ccyra1n I'd say WebKit because it's daily-drivable.
But much more importantly being aware enough to support/join an organisation or campaigns to actually defends your rights.
Because as seen in the past, Mozilla won't *actively* do anything against DRM.

And DRM is a legal mean first and foremost, from the software point of view they cannot work, but it's made illegal to workaround them.
So there should be law changes to at the very least reduce the applicable scope of DRM.