In Firefox... assuming no extensions, left click on the shield on the left end of the address bar.
See what things you have there.
Ynder "Tracking Content... I'm not blocking anything.
But this drop down will be a bit different for each website.
Under
Tools > Settings > Privacy and Security
Choose... Standard for Tracking Protection
UN-check everything else down to the Permissions section. In there, put a check in... Warn you when websites try to install addons.
Under Certificates, check mark both boxes
Under HTTPS only Mode, choose "Don't enable HTTPS only Mode
Under Enable Secure DNS using... choose the Default setting.
And if you haven't seen it yet... all my other Firefox tweaks are here...
Firefox... taming the beast part 2 !!
I run NO extensions in Firefox.