Extension does not autofill "accounts.firefox.com/signin" (Firefox only)

[apiraino]

General information

• Operating system + version: ubuntu 18.10
• Browser + version: Firefox 66.0b2
• Information about the host app:
  • How did you install it? Downloaded a pre-built binary
  • If installed an official release, put a version: 2.0.22
• Information about the browser extension:
  • How did you install it? downloaded a pre-built extension
  • Browserpass extension version as reported by your browser: 2.0.22

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Exact steps to reproduce the problem

1. go to accounts.firefox.com/signin
2. ctrl+shit+l to open the browserpass popup, search and select the desired pass item

What should happen?

• username/password form fields should be filled automatically
• The OTP popup should appear

What happened instead?

• username/password form fields are not filled automatically
• The OTP popup did not appear either

Additinal info:

• the password item is correctly unpacked, just not copied into the page
• on Chromium 71.0.3578.98 everything works

[apiraino]

Answering my own question (suddently came up to my mind).

For security reasons, by default Firefox does not allow extension to work in their domains.

I believe (not tested) that this can be overriden by hacking the about:config prefs.