Windows 11 Pro - Firefox blocks Instagram. I have no site blocks on or in my Firefox browser. There aren't any plug-ins enable or preventing Firefox from opening Instagram and sometimes other sites, yet it does this now. Whether it is 1 tab or 8 tabs, the outcome is the same. I've cleared the cache (daily), browser cookies, temp files (daily) and even restarted my computer many times, yet this issue still persists. I have attached the error message and proof that I have the latest Firefox update. Note: Other web browsers I use, don't have this issue. This issue is only with Firefox. Please help me resolve this issue. Your help is greatly appreciated.