I continue to be puzzled by this idea of direct donations being a panacea.
Firefox already has orders of magnitude more revenue than would come in from such a venture. And that already mobilizes development resources toward the core browser, which are already more substantial than what would be raised by direct donations. Just to use some back of the envelope math right now the revenue is something on the order of $500 million a year and I believe that software development is 50 to 60% and then infrastructure that supports the development which is under like administration and operations is another double digit percent.
As far as I know, when it comes to crowdsourcing resources for software development, there's basically no precedent for raising the amount of revenue necessary. The closest analog I can think of is Tor, which gives something on the order of $10 million a year. And the best crowd-sourced online fundraising for any project over all that I can think of as Wikipedia, which I believe is around like 280 million or so, which is slightly more than half of the revenue that Mosia already gets. But of course, Wikipedia leverages a vast user base. A kind of existing compact between themselves and users that I think has given them momentum, and because it's about content consumption rather than software, I think has a different relationship with its user base where it's hard to gauge how transferable it is as an example to Firefox.
I don't think assumptions that starting from scratch, they would eclipse Wikipedia are realistic. And I think the upshot of it is that the suggestion is that Firefox would be better off raising less revenue than they already do to maintain focused developer attention on the browser, which contrasts with a reality where they already invest more resources in that then would plausibly come from user donations, which seems to undercut the point that user donations would 'restore' focus on the browser.
I have nothing against user donations, but I just think for practical impact, especially in the short term, is quite limited and more about being invoked as a rhetorical point to imply an insufficient commitment to developing the core browser at present. I think despite being a big Firefox cheerleader, at present I do have concerns about their wandering direction, but I don't think it's realistic to think that direct user donations would have any impact on market share or would even substantially change the amount of resources available to invest in the browser.