Pale Moon does not come with any built-in advertisement/garbage filter. Pages using those technologies will not work as you would expect. Pale Moon does not support WebAssemly or WebRTC. WebGL pages render fine, JavaScript intensive pages are fine but there are some limitations. Pages load fast and they render as you would expect. Pale Moon generally fine for causal browsing.

Pale Moon has made improvements to the interface since they forked from Firefox in 2009, it is not identical but it does feel identical. The preferences dialog is almost identical to the one Firefox had before they 'modernized' it. A separate search-field to the right of the address bar, which is by default gone in Firefox (it can still be enabled), is shown by default and so is the useful menu line modern Firefox hides in favor of a smartphone hamburger-bar. The bottom status-bar Firefox had back then is still intact in Pale Moon.

The interface is what Firefox 24 had with several small changes. Those who have used the Firefox web browser for a very long time will immediately recognize Pale Moon as a very old Firefox version.

Pale moon reviews 2017