Note: this is very easy to replicate, at least for me (had a chance to test a loaner with Mojave), without setting up any external apps. With Firefox set as default (I used Nightly), open a terminal and run `open https://www.mozilla.org`. This will result in two windows being open. One has all the menus, the one with the new link has none. For what it's worth, this doesn't happen if I open an URL running Firefox from the command line with `--new-tab` or `--new-window` and a URL.
Bug 1603956 Comment 46 Edit History
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Note: this is very easy to replicate, at least for me (had a chance to test a loaner with ~Mojave~ Catalina), without setting up any external apps. With Firefox set as default (I used Nightly), open a terminal and run `open https://www.mozilla.org`. This will result in two windows being open. One has all the menus, the one with the new link has none. For what it's worth, this doesn't happen if I open an URL running Firefox from the command line with `--new-tab` or `--new-window` and a URL.