I probably make and view more videos than anybody ( Dreams ) and

I have No problem with Chrome all works fine for me Facebook included

only use Chrome

I don't use flash anymore, just html 5.

This is the best fix I have.

Lets say you use firefox and it isn't working right any more.

This is why, it has corrupted files.

If the usual emptying of all cached history data doesn't work you

could try this.

Delete everything in this folder C:\Users\you\AppData\Local\Mozilla\Firefox\Profiles\ .default\cache2\entries

If that doen't work,

First uninstall the program but that won't fix it.

Next you have to make visible all hidden files and folders in folder options.

C:\Users\you\AppData is the location where the corrupted files should be.

There should be 3 folders in AppData and you will have to look in each one

for firefox files and folders and delete them.Also look in common folders

in AppData and the program files folder and delete firefox out of there also.

If you are sure you have deleted everything then reinstall firefox.

Thank you very much Iben! 

You could totally delete firefox and install a different browser other

than firefox and use it for a few months or until it stops working and

then get rid of it as described above.

Now do a fresh install of firefox and it should work again.

You could try Brave browser and Vivaldi browser or maybe Linux.   

eh. just set up a different user account for your os? that way whatever she does shouldn't affect your profiles.

i personally use multiple browsers... i use firefox (noscript, ubo, umatrix), chrome to a lesser extent when unblocking stuff gets messy (ubo, umatrix), edge (when unblocking stuff on chrome gets to be a pain, also for pdfs..)