What is the site?

Not able to get on any sites, examples: email, Google. I use Firefox and Microsoft Edge for browser. Nothing working. Message is that there is a corrupt error on Firefox browser.

Have you already tried shutting down Windows 10 and starting it up again?

Could you test in Firefox's Safe Mode? In its Safe Mode, Firefox temporarily deactivates extensions, hardware acceleration, and some other advanced features to help you assess whether these are causing the problem.

If Firefox is not running: Hold down the Shift key when starting Firefox. (On Mac, hold down the option/alt key instead of the Shift key.)

If Firefox is running: You can restart Firefox in Safe Mode using either:

• "3-bar" menu button > "?" Help button > Restart with Add-ons Disabled
• (menu bar) Help menu > Restart with Add-ons Disabled

and OK the restart.

Both scenarios: A small dialog should appear. Click "Start in Safe Mode" (not Refresh).

Any improvement?

Also, can you check your connection setting here:

• Windows: "3-bar" menu button (or Tools menu) > Options
• Mac: "3-bar" menu button (or Firefox menu) > Preferences
• Linux: "3-bar" menu button (or Edit menu) > Preferences
• Any system: type or paste about:preferences into the address bar and press Enter/Return to load it

In the search box at the top of the page, type proxy and Firefox should filter to the "Settings" button, which you can click.

The default of "Use system proxy settings" piggybacks on your Windows/IE "LAN" setting. "Auto-detect" can lead to a flaky connection. You may want to try "No proxy".

Any difference?

Hello MintaBrown,

Just in case the above doesn't solve the problem - would you try this please :

Clear the Firefox cache :

https://support.mozilla.org/en-US/kb/how-clear-firefox-cache

"Remove the cookies" from websites that cause problems :

https://support.mozilla.org/en-US/kb/delete-cookies-remove-info-websites-stored (scroll down to : "Delete cookies for a single site")

I just saw some threads (on different forums) where this problem was reported, and clearing the cache and removing cookies solved the problem ......

Tried in safe mode. Same message: "Corrupt Content error ". I also cleared cookies and cache.

Is that the entire message for all sites, Corrupt Content error? Are there any other clues to go on?

At the bottom it says: "Mozilla Firefox seems slow to start". When I click on Google it does not respond. The email is very slow but finally opened.