Bug 1759724 - Enable PIP text tracks by default for nightly. r=pip-reviewers,kpatenio

Differential Revision: https://phabricator.services.mozilla.com/D141121

modules/libpref/init/all.js

@@ -410,7 +410,11 @@ pref("media.decoder-doctor.verbose", false);
 pref("media.decoder-doctor.new-issue-endpoint", "https://webcompat.com/issues/new");
 
 pref("media.videocontrols.picture-in-picture.enabled", false);
+#ifdef NIGHTLY_BUILD
+pref("media.videocontrols.picture-in-picture.display-text-tracks.enabled", true);
+#else
 pref("media.videocontrols.picture-in-picture.display-text-tracks.enabled", false);
+#endif
 pref("media.videocontrols.picture-in-picture.video-toggle.enabled", false);
 pref("media.videocontrols.picture-in-picture.video-toggle.always-show", false);
 pref("media.videocontrols.picture-in-picture.video-toggle.min-video-secs", 45);