Albus Luna is a Classic Firefox (tm) work-alike based on a well-known Firefox (tm) fork.

The up­stream fork — Pale Moon (tm) — is con­sid­er­ed to be important. However, it's dis­tri­bu­ted under unusually re­stric­tive terms and con­di­tions.

Albus Luna is, in short, a work­ing pre-Quantum Classic Firefox (tm) fork that you can mod­i­fy largely as you wish.

As of 2022, Albus Luna was the only non-End of Life browser of this type. Pale Moon (tm) had done the hard work but it was a walled garden.

A re­la­ted goal is assemble a few of the best XUL ex­ten­sions from the past 10 to 20 years and to ship them with Albus Luna. In some cases, the ex­ten­sions will be pre-in­stall­ed and in other cases they'll be avail­able but not in­stall­ed.

The browser comes with uBlock Origin, ScrapBook X, Tab Mix Plus, and Saved Password Editor pre-in­stall­ed and more ex­ten­sions will be add­ed.

The UXP Browser Bundle features Albus Luna and 7 other Mozilla pro­grams in one easy-to-build source tree:

Classic Firefox — As Albus Luna
Netscape — Or a reason­able facsimile
Seamonkey — As Blue Gorilla
Thunderbird — As Icedove, Interlink, and Epyrus
Chatzilla — As Ambassador
Borealis Navigator

Unpack the source tarball, install a few de­pen­den­cies, and run a single “bash” script. 4 hours later — de­pend­ing on hardware — you're Mozilla'd up with 8, count 'em, 8, Mozilla pro­grams that include XUL sup­port and no need for Rust.

It's never been this easy to fill your distro to burst­ing with pre-Quantum non-Rust Mozilla soft­ware. XUL Forever is the endeavour.