When comparing Internet Explorer vs Pale Moon, the Slant community recommends Pale Moon for most people. In the question“What are the best desktop web browsers?” Pale Moon is ranked 5th while Internet Explorer is ranked 64th. The most important reason people chose Pale Moon is:
"Classic" Firefox add-ons can work, but they are not supported and should be updated or forked to become a Pale Moon add-on.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Downloads well
Downloads safely, quickly, and nicely.
Pro System built-in browser
Browser has many system related features. With Internet Explorer you can run certain types of files, without saving them in a non-temporary directory, or you can change proxy settings via a built in Windows dialog window.
Pro Can fluidly stream 4k video
IE 11 can fluidly stream 4k videos on Youtube without issue.
Pro Works great with ruTorrent
Pro Isn't a big target for hackers
Nearly all browsers use the same browser engine as Chrome, Safari, or Firefox; meaning they have the same security-holes as one of the big three. IE doesn't, it has has its own engine.
In other words, even if you find yourself on a website that tries to hack your computer: It's very likely that the the website will only be designed to hack the big three, and wouldn't be able to do anything to IE.
Pro Has its own add-on ecosystem, built on time-tested technologies such as XUL (plus JS and CSS) and XPCOM
"Classic" Firefox add-ons can work, but they are not supported and should be updated or forked to become a Pale Moon add-on.
Pro Designed for usability, not the shiny new things
Pro Light on resources, although it's not its main focus
Pro Independent from Google and Mozilla
Pale Moon is an independent fork of an older version of Firefox. Therefore, it is independent from Mozilla and are not affected by their terrible decisions such as removing XUL, adding telemetry, pocket, etc.
Pro Customizable
Pro Stable
Pro Support for existing web standards
Pro Respects your privacy
Contains much less spyware than Chrome and Firefox and all of it can easily be disabled.
Pro Open source
So we can verify that the browser is not spyware.
Pro Supports complete themes
Pale Moon supports complete themes, something which Firefox used to have before version 57.
Pro Support for GTK themes
Pale Moon supports your GTK theme while Firefox does not.
Pro Uses Goanna layout engine
Unlike most other browsers, Pale Moon uses its custom engine.
Pro Has its own library of legacy extensions
Pro Very Independent
It isn't controlled by Google nor Mozilla, has its own engine.
Pro Good community support
Pro Optimized for modern processors
Pro Legacy Firefox
Cons
Con Out of date
Con Final version of the browser
Microsoft confirmed that Internet Explorer 11 (released on 2013, still bundled in Windows 10) will be the last version of Internet Explorer as Microsoft is shifting it's development focus to Microsoft Edge.
Con Windows only
Internet Explorer is currently available on Windows only. Internet Explorer was previously available on OS X and UNIX, but both of them have already been discontinued.
Con No browser extensions
Internet Explorer's functionality cannot be extended via extensions/plugins.

Con Not standard compliant
Con Problem rendering online Google Web Apps correctly
I.E. 11 has many issues with rendering Google Web Apps correctly such as Docs or Sheets. The landing pages for each has incorrect button placements and doubled icons, making the sites barely navigable.
Con It's slow and crashes a lot
Con Created By Microsoft
Con No reader view
Con Unsecure
Pale Moon lacks the sandboxing and other privacy protecting features included in latest Firefox releases.
Con Still contains some spyware
Default homepage is spyware and search suggestions and automatic updates are enabled by default.
Con Outdated rendering engine
It is an really old fork of Gecko that misses many of the newer web features.
Con Pale Moon is based on very outdated Firefox code
Con Uses Goanna
It an old Gecko-fork that is developed mainly by one man.
Con Lacks popular extensions and adblockers
It doesn't have ublock origin and umatrix.
Con Does not contain multi-process sandboxing
Con Android version has odd behavior
Clicking does not work.
Con Pale Moon's website is cloudflared
Con WebAssembly enabled by default
Con Lead developer loves Cloudflare and hates Tor
Website is cloudflared and he thinks most sites should be hostile towards tor.
Con Incompetent developers
