This should be fixed in the latest Beta and Nightly (Bug 1850828).

Dropa: Let’s say I drag a weblink from the browser address bar to the Finder. If you click and drag the padlock icon in Firefox (at the leftmost end of the address bar) you can drag a weblink to Finder to open later. I’m using a Mac and Finder is where you open windows, apps, etc. on a Mac.

If I double-click the bookmark or weblink from the Finder and Firefox is closed...

zeroknight: Should I just trash existing and reinstall latest version?

and thanks to both you and Dropa for responding

The next planned 117.0.x dot release is on September 12 but this fix might need more time for testing.