Addon on Firefox not working properly

Hello,

Now I'm using FIrefox 55.0.2 x64 with LastPass addon 4.1.62a, which I believe is the latest version.

When I click the config button, I mean the button with a gear icon, on any saved site, the interface of LastPass addon shrinks to a button saying "Back", but it leads to nowhere when I click the button. Yes, the addon is completely stuck on this "back" button! There's no way to resume but restarting the browser.

Please help

Thanks

I didn't find the right solution from the Internet

References:

https://forums.lastpass.com

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