http://bugs.winehq.org/show_bug.cgi?id=27436
--- Comment #3 from fracting fracting@gmail.com 2011-06-10 01:50:20 CDT --- (In reply to comment #2)
Did you copy the plugin to the right wineprefix?
Yes, I start winetricks, select the firefox wineprefix, then execute "Run a command line shell(for debugging)", then cd to $WINEPREFIX/ .
"winetricks firefox" installs it to ~/.local/share/wineprefixes/firefox/drive_c/...
"winetricks --no-isolate firefox" is the command needed to install it into the default wineprefix.
Also, your cp commands used backslashes, are you sure you got that right?
Yes,I'm sure. I can see the plugin in the "about:plugins" page after copy the plugin the the "plugins" directory.