Firefox does works with SSL vpn client. The best way to resolve your problem is to uninstall Firefox and then delete the files in the Firefox folder which are in your my documents folder (you can search for this). This is required to remove the old settings so that default settings come into effect.
Jan 27, 2020 Best Firefox VPN Add-ons for True Private Browsing in 2020 Jul 08, 2020 VPN for Firefox - Windscribe
Mozilla VPN review | TechRadar
VPN for Firefox | How to Setup and Use VPN on Mozilla How to Setup and Use VPN on Firefox. Just follow the steps below to know how to use VPN on your Mozilla Firefox Browser. Step 1: Open the Mozilla Firefox Browser. Step 2: Now go to the Firefox Add-ons Store in your browser. Step 3: Now you can see the search box on the top right corner of the Add-ons store, just click on the box and then search for the VPN name, it also provides you with the Vpn Mozilla Firefox Gratuit - easygood.biz
VPN for Firefox - Windscribe
Free Vpn Client Firefox - Free downloads and reviews vpn client for firefox free download - Free VPN Client, VPN Gate Client Plug-in with SoftEther VPN Client, VPN Client, and many more programs Mozilla VPN - A secure, private and fast VPN - Apps on Jul 10, 2020