My router firewall was somehow blocking the extension from finding and connecting even though Firefox itself was working fine with router firewall active. I disabled router firewall and PIA extension connected fine. I then closed Firefox and activated router firewall. After that the Firefox and PIA worked perfectly except PIA won't allow changing location unless I repeat the process of disabling-enabling router firewall. If I use the PIA Windows application this issue is not present.
Edit: The issue also occurs with Google's Chrome browser.

So far, so good. I will update my review if I run into major issues. I think people experiencing issues in private browser windows do not have the option for it enabled on the extension. I am running the extension, and the desktop app at the same time. I have also tried it with the desktop PIA app turned off, and have found no difference.

Web Developer Google Marketing Global Partner

Satisfaction Beyond Description...

Superb app. I love it!

Longtime user of PIA. I can't say enough good things about the quality of the service, their commitment to protecting users against the unethical practices of the tech industry and their customer service.

Since I have their core application installed on various devices (Desktop Linux, Android) it was only when testing various other live distros that I stumbled upon this extension. User-friendly UI, feature-rich and responsive (ie, lets you know when a connection is not secure because of flaky WiFi).

While I'd rather have system-wide protection using their Linux-based program, it's good to know that an easy to install, trusted and well-developed extension exist for other use cases. Keep up the great work, PIA!