Random question (sorry it's a tad off-topic), but have you tried Pale Moon? Available for Linux and Windows, uses the classic "Firefox" interface (it's a fork of Firefox 24, so no awful Australis), but is up to date with security and other feature updates. And as some newer addons are more problematic with old FF versions, there's a Pale Moon specific addon site which contains more compatible stuff, including some addon forks. I use it with AdBlock Latitude, which is a ported version of AdBlock Plus. Works a treat!
Systems in use:
- Lithium : R14000 600MHz CPU, 4GB RAM, V10 Graphics, 36GB 15k HDD & 300GB 10k HDD, New/quiet fans, IRIX 6.5.30
- Nitrogen : R10000 195MHz CPU, 384MB RAM, SolidIMPACT Graphics, 36GB 15k HDD & 300GB 10k HDD, New/quiet fans, IRIX 6.5.22
Other systems in storage: x 2, x 2
- Lithium : R14000 600MHz CPU, 4GB RAM, V10 Graphics, 36GB 15k HDD & 300GB 10k HDD, New/quiet fans, IRIX 6.5.30
- Nitrogen : R10000 195MHz CPU, 384MB RAM, SolidIMPACT Graphics, 36GB 15k HDD & 300GB 10k HDD, New/quiet fans, IRIX 6.5.22
Other systems in storage: x 2, x 2