The ability to compile it is blocking 10.9 and 10.10 support as well as non-SSE4.1 support. A compiled patched version of Firefox 78 ESR would theoretically be able to support even 10.7!
EDIT: however, it would take me a while to track down all of the UI code for 10.9 they removed, and I might not have time.
EDIT 2: As of 2021-10-24, Firefox Legacy is no longer supported, and there will be no further updates.
EDIT: however, it would take me a while to track down all of the UI code for 10.9 they removed, and I might not have time.
EDIT 2: As of 2021-10-24, Firefox Legacy is no longer supported, and there will be no further updates.
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