Palemoon is just a fork of obsolete Firefox which is liable to suffer from vulnerabilities already fixed in Firefox. At this point it lacks support for a vibrant ecosystem of Firefox extensions.
It also lacks the substantial improvements to hardware accelerated decoding on linux within the last year or so and improvements in performance.
It does have a sync backend but inactive account data may be deleted and if the project is shuttered your data is kaput.
It also lacks Android and ios support meaning you lack the virtuos benefits of using the same tech on all platforms like syncing passwords and bookmarks.
They also recently improved integration by allowing you to browse open tabs on synced computers
Firefox in also has in the last while added privacy preserving local translation support and long ago added really good local reader mode.
Also my browsing would be less nice without addons like Sideberry and Tridactyl not to mention colorful via pywal.
Then we get to adblocking an arms race that Palemoon with its several year old (2021)version of uBlock that will never be updated stands to lose.
Also the lack of a mobile version means that your options for adblock on the go are meager unless you either run Firefox Mobile or look into a more complicated option like pihole with its own tradeoffs like not being able to turn it off for a site with a click.
Firefox has been making dumb communication mistakes and been too friendly with partners but it remains in my opinion the best choice. Dumb choices like this can easily be disabled and if that becomes onerous libreWolf unlike Palemoon is just Firefox with different privacy friendly defaults.
That said it also requires more setup as far as addons and sync which is why I prefer to simply configure Firefox.
It also lacks the substantial improvements to hardware accelerated decoding on linux within the last year or so and improvements in performance.
It does have a sync backend but inactive account data may be deleted and if the project is shuttered your data is kaput.
It also lacks Android and ios support meaning you lack the virtuos benefits of using the same tech on all platforms like syncing passwords and bookmarks.
They also recently improved integration by allowing you to browse open tabs on synced computers
Firefox in also has in the last while added privacy preserving local translation support and long ago added really good local reader mode.
Also my browsing would be less nice without addons like Sideberry and Tridactyl not to mention colorful via pywal.
Then we get to adblocking an arms race that Palemoon with its several year old (2021)version of uBlock that will never be updated stands to lose.
Also the lack of a mobile version means that your options for adblock on the go are meager unless you either run Firefox Mobile or look into a more complicated option like pihole with its own tradeoffs like not being able to turn it off for a site with a click.
Firefox has been making dumb communication mistakes and been too friendly with partners but it remains in my opinion the best choice. Dumb choices like this can easily be disabled and if that becomes onerous libreWolf unlike Palemoon is just Firefox with different privacy friendly defaults.
That said it also requires more setup as far as addons and sync which is why I prefer to simply configure Firefox.