The problem you have is that a key bit of the Adobe spec... That of SWF verification... Is NOT publicly specified.  It's also used he/ily by the BBC and Channel 4 in iPlayer and 4OD.  Rather critical needs...

----- Original message -----
> When this problem first manifested itself, I made some comments in the
> 'bug' thread I started regarding my need to switch back to MS Vista that
> were somewhat aggravated. I would just like to take this moment to
> apologise to all Ubuntu developers for what I said. The problem is that
> the Flash update came right at the wrong time, right when I was in the
> middle of a very important operation. It took me two weeks to finish
> what I was doing, and in that time I never had so many problems with my
> machine until I reloaded the OEM version of Vista that came with my
> computer.   I couldn't wait to switch back to the Ubuntu world again.
> 
> For the record, I think that Ubuntu is the best breath of fresh air that
> the PC world has ever seen. It makes anything that Microsoft ever
> created look sick by comparison, and I truly hope you all keep up the
> good work. If I wasn't so busy writing a new GUI based OS for FreeDOS, I
> would help you myself, but there are just so many hours in a day and I
> can't split them up any more.
> 
> Also, perhaps the Ubuntu community should seriously look into the
> possibility of writing it's own Flash player; one that is unique to this
> OS. That would eliminate all further problems from using outside
> software. Since we would not be changing the Flash format, just playing
> the files, copyright issues should not be a problem, particularly if it
> can be proven that the current Flash player from Adobe does not function
> properly in Linux because of a premeditated effort to remove an
> important facet of Internet use to the entire Linux community.   If Adobe
> goes after Linux for any infringement suit, then we can always come back
> on them for an anti-trust suit,   in that they are attempting to generate
> a 100% monopoly that is made only to benefit 'for profit' corporations
> like Microsoft and Apple.   Taking this action would eliminate all future
> Flash revision situations like this in the future, as we would be able
> to make changes on-the-fly.
> 
> Sorry about the thread drift guys, but it was important for me to let
> you all know how I really feel.
> 
> -- 
> You received this bug notification because you are subscribed to a
> duplicate bug report (872714).
> https://bugs.launchpad.net/bugs/875538
> 
> Title:
>     [Firefox 3.6.23] Impossible to open firefox because firefox-bin
>     process is still running
> 
> Status in “firefox” package in Ubuntu:
>     Invalid
> Status in “flashplugin-nonfree” package in Ubuntu:
>     Invalid
> Status in “firefox” source package in Lucid:
>     Triaged
> Status in “flashplugin-nonfree” source package in Lucid:
>     Triaged
> Status in “firefox” source package in Maverick:
>     Triaged
> Status in “flashplugin-nonfree” source package in Maverick:
>     Triaged
> 
> Bug description:
>     After upgrading firefox to version 3.6.23 few days ago, firefox does
>     not work properly.
> 
>     At firt use after computer starting, firefox works well.
>     It is possible to close firefox without any issue.
>     But at second starting, firefox indicates it is impossible to launch
> firefox because firefox-bin process is still running.   The workaround is
> to restart the computer, or simply kill the firefox-bin process.
> 
>     This behaviour happened right after upgrading firefox to version
>     3.6.23, and is systematic with the profil user I use (it's an admin
>     user).
> 
>     I tested with another profil (non admin) on the computer: The problem
>     has not been reproduced.
> 
>     System is 10.04 LTS (kernel 2.6.32-33 generic)
> 
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/875538/+subscriptions