Oh for sure criticism is valid, but it's funny how people always forget all the actual good stuff being added, too.
In general, not just Firefox-specific. People constantly forget how while Google search results have gone to shit, empyrical analysis showed that it went to shit more for other search engines (meaning if anything Google got comparatively better, but of course everyone got worse across the board, too). People constantly forget over all their little issues how some countries, including mine, have swapped >50% of their energy (from ~0%) to green energy in just 10 or so years. It's too easy to see only the negative things.