SWF files are not open in a web browser

[Sylvhem]

Since the update to Ubuntu 14.04 Trusty Tahr, ShockWave Flash files are not open in a web browser anymore. Indeed, when I clicking on it or when I use the Open with > "Name_of_one_brother" entry of the contextual menu, the browser open a download dialogue box instead of opening the file. The only way to launch the animation is to include it in a HTML file using an EMBED element.
I actually have flasplugin-installer 11.2.202.291ubuntu0.13.04.1 installed on my computer and I use Mozilla Firefox 29.0.
According to http://forum.ubuntu-fr.org/viewtopic.php?id=1531681 , it seems that problem affect several users.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Valentin Crone (va-crone)]

Hello,
I have already this bug.
Tested on Firefox 28 and 29 with the flashplugin.

Ubuntu 12.04 LTS: not present.
Ubuntu 14.04 LTS: present.
(I have tested each version of Firefox [28/29] on each version of Ubuntu [12.04 LTS/14.04 LTS])
Thank you.

[[e-mail] (fifilecanari)]

A solution waiting for a better one:

1) Install wine
2) download standalone flashplayer here: http://labs.adobe.com/downloads/flashplayer.html
3) Create a desktop file in /usr/share/applications (see the example file)
4) Set flashplayer as defaut viewer in the properties of a swf file

[Steve (steve-netxtime)]

Another solution, with one ligne (works with FireFox) :

echo "application/x-shockwave-flash swf swfl" >> ~/.mime.types

Source : http://askubuntu.com/questions/478169/why-cant-firefox-run-local-swf-files