https://support.mozilla.org/en-US/kb/hyperlinks-in-messages-not-working

I would uninstall chrome as it can cause default confusion.

set Firefox browser as the default both within Firefox and in OS default apps. Then restart Thunderbird.

Check Settings > General Under 'Files & Attachments' to see what is set for http and https normally you do not need any setting if computer default set up correctly with prefered browser so if you locate them either set prefered browser or remove.

In Settings > General scroll to bottom and click on 'Config Editor' check network.protocol-handler.external-default = TRUE If false then use the toggle icon on the right to change from false to true.

I have been using Chrome for many years now with no problem. The same can be said for Thunderbird. I don't plan to change my browser because it has always worked with Thunderbird hyperlinks. If I can't solve this, I plan to try Outlook or Gmail as a replacement for Thunderbird. Thanks for the years Thunderbird has served me well in the past. - Jim Archibald

Sorry, I assumed Firefox because it was listed first and no other information on preference was mentioned. But regardless, it does not change the instructions - try uninstallling Firefox to help computer be less confused and set chrome as default.

It would be helpful if you could offer information. Have you uninstalled Firefox ? Has chrome been freshly set up as default in the computer default apps settings? Is chrome set as default from within chrome ?

In Settings > General scroll to bottom and click on 'Config Editor' check:

• network.protocol-handler.external-default = TRUE
• network.protocol-handler.warn-external = True

Are they set to True ?

Check Settings > General Under 'Files & Attachments' to see what is set for http and https do you see http and https listed under content ? If yes, are they set to use chrome?

Have you uninstalled Firefox?

YES

Has chrome been freshly set up as default in the computer default apps settings? YES Is chrome set as default from within chrome? YES In Settings > General scroll to bottom and click on 'Config Editor' check:

   network.protocol-handler.external-default = TRUE  YES
   network.protocol-handler.warn-external = True  YES

Are they set to True ? YES Check Settings > General Under 'Files & Attachments' to see what is set for http and https do you see http and https listed under content ? If yes, are they set to use chrome? YES

This did NOT solve my problem, but thanks for your patience and help. Jim Archibald