hello F.S.Crawler, '''Clear all cookies, site data and cache''' * Click the menu button. and select Options. * Select the Privacy & Security panel and go to the Cookies and Site Data section. * Click the Clear Data… button. The Clear Data dialog will appear. ... * Click Clear. 1. Type '''about:config''' in the address bar and press Enter. 2. A warning page may appear. Click '''Accept the Risk and Continue''' to continue to the about:config page. 3. Search for '''security.sandbox.content.level''' 4. Click the Edit<img src="https://user-media-prod-cdn.itsre-sumo.mozilla.net/uploads/gallery/images/2019-10-29-08-54-56-1f86ca.png">aboutconfig-EditButton button for the preference and set its value to '''1'''. 5. Click on the checkmark <img src="https://user-media-prod-cdn.itsre-sumo.mozilla.net/uploads/gallery/images/2019-11-04-06-45-04-f67b18.png">aboutconfig-Checkmark to save the change. 6. Restart Firefox. tell me its helped. Regards, Arman