Firefox Community Forum

After the recent bunch of windows updates i started noticing youtube loading much slower and other websites acting strange. Just now i tried to look at a link https://steamusercontent-a.akamaihd.net/ugc/47948470127416586/912CDEE3AD8B94CF3122B7338E89E24C9B6EC29D/

I get "No video support and MIME type found". I have uninstall/reinstalled, checked codex, disabled addons and downloaded Microsoft windows media pack, then restarted the computer.

Nothing seems to work. But i had to reinstall Firefox again because all my tabs would crash after the last reinstall.

I get this an awful lot with Newmax, with or without my vpn, makes no difference, and it also makes no sense. I can't believe that a major news site is a security threat vis-a-vis my dinky linux computer in Virginia. What's going on?

Yesterday when I tried to open my gmail in Firefox I got this page coming up Clear cache & cookies

When you use a browser, like Chrome, it saves some information from websites in its cache and cookies. Clearing them fixes certain problems, like loading or formatting issues on sites. Computer AndroidiPhone & iPad In Chrome

   On your computer, open Chrome.
   At the top right, click More More and then Delete browsing data.
   Choose a time range, like Last hour or All time.
   Select the types of information you want to remove.
   Click Delete data.
       If you delete cookies while signed in to Chrome, you won't be signed out of your Google Account.

I'm concerned about deleting data, it's always worked until yesterday.

Should I follow these instructions?