gnash plugin unavailable in Firefox after instalation

[karaluh]

As in summary. after installation I restarted Firefox, but there is no gnash neither in extensions, nor in plugins. I have also adobe flash installed, I don't know if it matters.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: browser-plugin-gnash 0.8.10~git20110618-3ubuntu1
Uname: Linux 3.3.0-030300-generic i686
ApportVersion: 1.23-0ubuntu4
Architecture: i386
Date: Fri Apr 20 12:54:20 2012
ProcEnviron:
 LANGUAGE=pl_PL:pl:en_GB:en
 PATH=(custom, user)
 LANG=pl_PL.UTF-8
 SHELL=/bin/bash
SourcePackage: gnash
UpgradeStatus: Upgraded to oneiric on 2011-10-18 (184 days ago)