When comparing Ungoogled Chromium vs Pale Moon, the Slant community recommends Pale Moon for most people. In the question“What are the best web browsers for Windows?” Pale Moon is ranked 12th while Ungoogled Chromium is ranked 20th. 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 No telemetry
Pro Free software
100% Open Source and Libre.
Pro Amazing UI
Very clean and slick UI.
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 Few independent devs fighting the good fight
Although their work is to be fully commended, it can not be ignored that the devs of ungoogled Chromium are doing a massive task, and TBH waste their time while doing it. They're up against mega corp Google, reversing all the questionable stuff Google puts in Chrome to make them money. So David and Goliath, or a few devs in their spare time against "CyberDyne" if you will. So continuity might be an issue with ungoogled Chromium. Will it be up-to-date? Will it survive to see another day? Will the devs loose interest? The answer will most likely depend on your (previous) experience and scepticism.
Con Sometimes outdated
Con Still contains telementery
Default home page is telementery, and most websites are enabled by google.
Con Some websites think it is Chrome 80
As of today, many sites, like login.iready.com , might mislabel the browser as chrome.
Con Uses blink V8 turbo
It a old blink fork that is made up by nicwow.
Con Chrome clone
Ungoogled Chromium is a clone of Chrome, and since clone browsers are behind in updates giving a huge security risk, browsers like Tuga browser and Ungoogled Chromium should be avoided.
Con Uses a fake browser engine
Con Looks proprietary
Ungoogled Chromium is not that open source, but it might be closed source for windows 8.1 and below.
Con Difficult to install
Con Mostly just a customized Chromium build
Not much new here as many of chromiums features can be enabled or turned off with build flags.
Con Dependent on Google
Does not free you from big corpo.
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.