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I want to try Icecat browser (I like having different yet similar browsers, so I want this beside Firefox).

To install

sudo add-apt-repository ppa:gnuzilla-team/ppa && sudo apt-get update && sudo apt-get install icecat -y

enter image description here

but then:

enter image description here

But Java is enabled

enter image description here

the list of plugins is the same in Icecat and Firefox, where gmail works fine.

what could be the matter?

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yes i liked it :D – Dimitris Theodoridis Apr 27 '13 at 15:30
up vote 1 down vote accepted

Icecat comes with an enabled extension (GNU LibreJS) that "blocks nonfree nontrivial JavaScript while allowing JavaScript that is free and/or trivial".

enter image description here

Disabling the addon solves the problem reported here.

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