hello jjlibman, this is unfortunately a known regression in firefox 25 that is affecting a small portion of users, for reference please refer to bug #933733.

your best option is probably to downgrade to firefox 24 at the moment until the issue gets resolved.

Install an older version of Firefox

i backed up to 24...it helped somewhat...full screen video still freezes on the video only...not audio...

the results seem spotty but at least it doesn't freeze every time. i am going to look at video driver updates to see if it is related.

I got the winzip utilities package and updated a bunch of drivers for my hp laptop. The problem has been resolved. I returned firefox to version 25 as well, and still have no problems.

hey, just to keep you updated - there is now a fix available for firefox 25, which should address the particular problem of pages not loading unless the mouse is moved.

if you have downgraded to firefox 24 to work around the issue, please go to firefox > options > advanced > update and turn automatic updates back on. then go to firefox > help > about firefox which should trigger the update to firefox 25.0.1. in case you need to download the setup file for firefox 25.0.1 separately you can do so from https://www.mozilla.org/firefox/channel/#firefox