PSA: Do not set XPCSHELL_TEST_PROFILE_DIR for RemoteSettings DevTools

[Julian Descottes]

Hi,

If you already used Remote Settings DevTools (https://github.com/mozilla-extensions/remote-settings-devtools) and/or you have weird issues with the Browser Toolbox / Browser Console, check the instructions below. If not, you can probably stop reading now.

Remote Settings DevTools require an environment variable to be set in order to work against Beta or Release channels. We used to rely on XPCSHELL_TEST_PROFILE_DIR for this, but this no longer works and will also prevent you from using the Browser Toolbox or the Browser Console properly. You can easily tell if the Browser Toolbox is running with this invalid configuration because the title of the window will be "XPCShell Toolbox" instead of the expected "Browser Toolbox" (or "Multiprocess Browser Toolbox").

The new environment variable is MOZ_REMOTE_SETTINGS_DEVTOOLS=1, and will have no side effect on the Browser Toolbox / Browser Console.

You can read more details about this change over at https://bugzilla.mozilla.org/show_bug.cgi?id=1758645 and related bugs.

Thanks.

Julian