Saw some good news for gnu,
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Icecat seems to be kept up to date now more...
Very good thing for people who want current firefox but without the trash it has.
IceCat has some extra stuff (like LibreJS) that people might not want, that's why it's not the default browser in Trisquel.
Abrowser is the non-ESR version of the same basic build process as IceCat as far as I understand. Ruben is listed as a primary developer for both. Abrowser is kept current.