Chrome版はすんなり機能したがFirefox版はまったく機能しなかった。いろいろ考えて、FoxyProxyを外したところちゃんと動作した。
システム全体をProxy化するといろいろ問題が出てくる上に接続までやたらと時間がかかるが、このブラウザ拡張バージョンなら接続は一瞬だし、会社とのVPNにも悪さしないし最高だと思う。

Disconnects after each url entry. Pointless.

EDIT:
This addon doesn’t play well with uBlock Origin or PureVPN (even if not active). Disabling the addons seems to work. I would hope that the devs take a look at this as uBlock is an important part of web browsing security for many.

Doesnt work anymore, if I click on the symbol there is no popup for credentials.

为什么我无法添加这个组件 显示红色禁止标志

Many connection problems

Does not connect automatically on browser start!

That's good! Please add option Auto Connect when opening browser.

it's the worst VPN extension for Mozilla Firefox. I have paid for 24 months service, but it buggies all the time since my trial period is over.