That's interesting, I had not heard of it before. Shows the benefit of things like Firefox being open source allowing computer geeks and enthusiasts to update security and keep adding improvements based on what the users wish to have.
FTR, Chromium is also open source, so there are numerous forks of both Chrome and Firefox. In both cases, developers can (and usually do) choose to leave out the privacy invasive stuff.
De-googled forks of the Chromium base include Brave, Iron, Opera, Supermium, Thorium, Ungoogled-Chromium, and a few others. Brave, in particular, is known for its strong privacy features. Google Chrome itself dropped support for Windows 7 after Chrome 109, so many of the forks did as well. However, Supermium and Thorium have maintained Win7 support by taking the current Chromium base code and back-porting it to Win7 or earlier.
Forks of the Firefox base include LibreWolf, Pale Moon, r3dfox, and Waterfox. However, when Firefox dropped Win7 support after v. 116, most of these did, as well. Notable, r3dfox bucks the trend, and like Supermium and Thorium in the Chromium camp, it takes the current Win10/11 Firefox base and back-ports it to Win7.
For this reason, the only browsers I would recommend for Win7 use are
r3dfox,
Supermium, or
Thorium. They should provide all the same security benefits for Win7 users as more recent versions of Firefox or Chrome, even though Firefox and Chrome have abandoned Win7 users.
While we're at it, let me mention all three are also available in portable versions. I only use portable versions because everything is self-contained in one folder, not splattered about your system in "Program Files", "Appdata", "Userdata", "System32", and numerous registry entries. Everything in one folder makes it super easy to backup, move, or update your browser and its configuration. Portable versions also make it easy to use multiple browsers and multiple versions, if desired.