Can't install other add-ons

[Remy Adriaanse]

After the installation of Unity Desktop Intergration 3.0.2 plugin for Firefox 29.0, it is unpossible to install any other plugin, theme, or searchbar.

When installaling a plugin, there is a notification that says:
"Sorry, you need a Mozilla-based browser (such as Firefox) to install a plugin"

Just disable the application, and the problem in gone.

specs:

Plugin: Unity Desktop Interfration 3.0.2
Browser: Firefox 29.0
OS: Linux version 3.13.0-24-generic , gcc version 4.8.2 , Ubuntu 4.8.2-19ubuntu1 , #47-Ubuntu SMP Fri May 2 23:30:00 UTC 2014

Running all the latest updates & patches.

[Robert Bruce Park (robru)]

Hi, I'm using Firefox 29.0 and Unity Desktop Integration 3.0.2 and I'm not able to reproduce this issue, I've installed many themes and extensions just fine.

Is there a specific plugin that's giving you this issue? Can you tell us the names of one or two plugins that give you this error?

Thanks.

[Launchpad Janitor (janitor)]

[Expired for WebApps: unity-firefox-extension because there has been no activity for 60 days.]

[Christoffer Aberg (christoffer-aberg)]

I can reproduce this bug with several search engines, for example with the "Thesaurus - Reference.com" (https://addons.mozilla.org/en-us/firefox/addon/thesaurus-referencecom/?src=ss) or the "SAOL" (https://addons.mozilla.org/en-us/firefox/addon/saol/) search engines.

Disabling the Unity Desktop Integration add-on and restarting Firefox I can add the search engine without issues.

I have had this problem ever since a fresh install of Ubuntu 14.04, but current set-up is:

Plugin: Unity Desktop Integration version 3.0.2
Browser: Firefox 31.0
OS: Ubuntu 14.04, running all the latest updates and patches

[Ciro Santilli 六四事件 法轮功 (cirosantilli)]

This was also reported at: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1363590