firefox-bin: strip signatures on darwin (#457408)

## configurability of the wrapper itself

browser:

browser_:

let

  isDarwin = stdenv.hostPlatform.isDarwin;

  browser =

    # Wrapper breaks codesigning on macOS; though plugins that may require

    # original mozilla signature (like 1Password) won't work with signatures

    # stripped, at least the wrapped browser will launch.

    if isDarwin then

      browser_.overrideAttrs (oldAttrs: {

        dontFixup = false;

      })

    else

      browser_;

  wrapper =

    {

      applicationName ? browser.binaryName or (lib.getName browser), # Note: this is actually *binary* name and is different from browser.applicationName, which is *app* name!