[hsivonen]

> A complicating factor on the telemetry is that both this new "guess" option and its predecessor list are/were in the menubar View menu and have no way to be accessed through the "hamburger," so there wasn't a default-visible way to get to this functionality for Windows and Linux users.

The collapsing the submenu of the View menu into a single item shipped in Firefox 91. The submenu was removed from the hamburger menu in Firefox 89.

This order of changes was unfortunate. If I had gotten the single-item design done sooner, perhaps the rewritten hamburger menu would have kept the single item instead of removing the entry point altogether.