[demetris]

Firefox could (should?) be better in several aspects but it seems excessive to say it is pretty irrelevant.

It has 4.5% market share in Europe, 9% in Germany (statcounter numbers).

It is the browser that got the Google Labs folks to write a Rust jxl decoder for it, and now, thanks in part to that, Chrome is re-adding support for jxl.

You can be unhappy with Firefox (I often am myself), and Firefox HAS lost relevance, but can you really say it has become pretty irrelevant?