Pale Moon is not a “15-year old browser” and constantly gets updates with “new technologies” being added.

Please do a research the next time you’re going to give your opinion on some topic.

worth using

Why is Pale Moon not “worth using”?

None of the various Firefox forks has any chance to keep existing without Firefox

False.

They can’t make all the old versions disappear from the Internet

Meanwhile DMCA:

Btw, 1.5.2 is the last version which you can run straight from the .jar. All versions after it require some sort of authentication bypass.

letter-spacing*

bold, italics, etc. are used to indicate context

How can you guarantee they are? There are no technical restrictions or instructions on how much or where you can use emphasis and strong emphasis in your message. Until that’s not the case, “italic” and “bold” should be treated as purely presentational markup.

used for accessibility purposes

Screen readers do not and should not care about presentation; abusing semantic markup to indicate through emphasis that something is italic or bold is anti-accessibility.