URL: https://fr.lita.co/

Browser / Version: Firefox 87.0
Operating System: Linux
Tested Another Browser: Yes Chrome

Problem type: Site is not usable
Description: Unable to type
Steps to Reproduce:
The "email" field in the "Login" popup loses focus when Firefox loses focus. Steps:

1. Goto lita.co
2. Click "Log in", this opens a "popup"
3. Click the email field, begin typing
4. Switch to another tab or another window
5. Come back to lita.co
   The "email" field is no longer focused. This behavior breaks e.g. my password manager (because Firefox loses focus while I browse my passwords).

View the screenshot

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