Firefox browser opens after clicking on link in email, but I cannot do anything in the browser

When I click on a link my default browser Firefox opens but it is blank, nothing works..
I have to copy the link and then start Firefox myself and paste the link and then Firefox works great.
Only clicking on a link from my Thunderbird mail program means that I cannot do anything with the Firefox browser.
I use Zorin OS 17.1 Core and mail is Mozilla Thunderbird.

This sounds like an issue caused by the package format used by either Firefox or Thunderbird, or both. Take a look at these threads for more details:

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Very good, thank you very much.
I uninstalled Firefox flatpack and installed Firefox.deb.
Problem has been solved.

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