It's written by a clueless idiot.
Initially, based on Firefox, this web browser has taken a different route lately in its quest to maintain features that Mozilla opted to drop over the years. This made it a safe place for these Firefox users.
Ok, so far so good...
That said, while this is still a competent web browser, high on customization potential and excellent ease of use, it has started to falter when it comes to performance and overall feature set. Many modern web browsers like Chrome, Vivaldi, and, of course, Firefox Quantum, has it beat these days.
How? No elaboration obviously.
To complicate matters further, Mozilla switching to the WebExtensions format means that the thousands of classic add-ons that were available on Firefox no longer work on Pale Moon. The browser does offer its extensions, themes, and search plugins, but it’s not quite that.
So if Mozilla switches to WebExtensions, that means classic addons will no longer work...on Pale Moon
? Which you, dear author, previously acknowledged for preserving compatibility? Pass the bong, that's some great stuff you're smoking.
Cons - feels like an old version of Firefox
That's a feature, not a bug, you idiot. 'Old' here equals usable on a desktop, not dumbed down for mobile.
Cons - Reduced selection of extensions due to format change
Never mind the thousands of classic extensions available via CAA over 10 years that you'd have heard of if you did your homework.
How many WebExtensions exist now, compared to what's on CAA?