[Mozilla] Exclude graphs

Link: https://mail1.eff.org/pipermail/https-everywhere-rules/2013-July/001649.html
[Imgur] Add exclusions

Link: https://mail1.eff.org/pipermail/https-everywhere-rules/2013-July/001645.html
[Imgur] Add store

Link: https://mail1.eff.org/pipermail/https-everywhere-rules/2013-July/001645.html
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