I still use Firefox, it's still regularly updated and it still works very well. It pretty much does the job, regardless its number of users. It'll be dead when it won't receive updates anymore.
I don't understand what good can be done by considering it dead right now.
The one odd incompatible road here and there is also mostly there. These roads or the unpopular car we are speaking about only needs a few superficial tweaks. Nothing fundamental.
I know, I'm still rocking this car. It has the best windshield wipers of the market, for the very rainy roads.
It is also free so it's not like I'm making a big investment by picking it and risking it becomes irrelevant soon. Which I don't see coming, to be clear.
But still - what reality is there to face? At absolute worse we...switch browser in 10 years?
Indeed, it's your opinion. Development and benchmark tells another story:
https://arewefastyet.com/win10/benchmarks/overview?numDays=6...
OTOH, Firefox's "perceived slowness" is mostly due to your local DNS response times. On fast DNS, Firefox is at least equal to chrome in terms of speed.
That's essentially Vivaldi. Also stores your data in Iceland for people who care about that kind of stuff and has some pretty good QoL features build in like tab tiling.
This says it's opt out, not in.
If you mean the sponsored ads on the New Tab page, then yes they are indeed opt-out. But the person who I responded found the browser pop-ups annnoying. That is a part of Brave Rewards. The New Tab page ads are not a part of Brave Rewards unless you explicitly enable that in the settings (second section of the link you mentioned).
You do not need to participate in Rewards in order to enjoy Brave. However, note that sponsored images on the New Tab Page are on by default, but can easily be disabled. (If you enable Brave Rewards, you will earn for the New Tab Page sponsored images you see.)