Please try this:

Exit Thunderbird.

Make Firefox your default browser:

• https://support.mozilla.org/en-US/kb/make-firefox-your-default-browser

Start Thunderbird Now check to see if the http and https setting is pointing to the wrong browser. Menu app icon > Preferences > General scroll down to 'Files & Attachments' section Do you see any mention of http and https in the 'Content Type' column ? Either delete the setting or choose specific browser. then restart Thunderbird.

Please report back on what you discovered.

hi, I am using linux manjaro.

Appears only http and I have inserted "ask for the browser" (or something similar, as I wanted.

Remains the problem of https. How can I inseert the protocol?

Thank you

I resolved the problem facing it directly. I have handily by changing mimeTypes.rdf and substituting the string chromium with firefox.

Please introduce a Thunderbird interface able to resolve this bug.

Regards.

(To the staff - read and mark resolved)