In _TB3: Tor Browser's official .mozconfigs._, we set ``` imply_option("MOZ_DEDICATED_PROFILES", False) ``` This option makes us use a single profile for all our channels. Personally, I do not like this option very much (but at this point it's part of our legacy, for Tor Browser). But what should we do with Base Browser/S131 browser? Should we move it to the base-browser `mozconfig` commit? Without it, when we make Firefox create the actual profiles (e.g., with portable mode off), it creates a [default profile for legacy versions](https://searchfox.org/mozilla-central/rev/e6b709df9b93858364f02ab89f40d78762693db8/toolkit/profile/nsToolkitProfileService.cpp#1684), see also [Bug 1770174](https://bugzilla.mozilla.org/show_bug.cgi?id=1770174). We could put these lines between `ifdef`/`endif` when we don't want this behavior, while keeping the dedicated profiles.