No problem this is actually a very simple problem to solve. All you need is a browser add on that will add gmail to that list. As stated in this article. The add-on you seem to be looking for is (G)mailto: . Please close the support ticket if it helps!

Sorry, I don't need this addon: it doesn't solve my problem.

I can follow mailto links within Firefox, I want mailto links from an application to lauch Firefox.

At the moment, I have only Outlook as a possible choice in the window: Default Programs => Associate a file type or a protocol !

I have tried changing the registry settings with info gathered from several web page ... with no results.

Any ideas ?

The Firefox setting for e-mails is a Firefox setting only. You need to access your computers Setting Manager and make the changes there. I do not know what it is called on Linux.

I Updated Tags User agent shown as Linux, but forum tag Windows7 added and Linux tag deleted. ~J99

My bad: I did not give enough information !

I am running Firefox 35.0 on Windows 7.

I have tried modifying the registry as stated on MozillaZine: http://kb.mozillazine.org/Register_protocol

I have created the following registry file ... with no result:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Firefox.URL.mailto] @="URL : Protocole MailTo" "URL Protocol"=""

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Firefox.URL.mailto\DefaultIcon] @="C:\\Program Files (x86)\\Mozilla Firefox\\firefox.exe,1"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Firefox.URL.mailto\shell] @="open"

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Firefox.URL.mailto\shell\open]

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Firefox.URL.mailto\shell\open\command] @="\"C:\\Program Files (x86)\\Mozilla Firefox\\firefox.exe\" -osint -url \"%1\""

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail]

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Firefox] @="Firefox"

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Firefox\shell]

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Firefox\Capabilities\UrlAssociations] "mailto"="Firefox.URL.mailto"

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Firefox\shell\open]

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Firefox\shell\open\command] @="\"C:\\Program Files (x86)\\Mozilla Firefox\\firefox.exe\" -osint -url \"%1\""

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Firefox\Protocols]

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Firefox\Protocols\mailto] @="URL : Protocole MailTo" "URL Protocol"=""

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Firefox\Protocols\mailto\DefaultIcon] @="C:\\Program Files (x86)\\Mozilla Firefox\\firefox.exe,1"

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Firefox\Protocols\mailto\shell]

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Firefox\Protocols\mailto\shell\open]

[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\Mail\Firefox\Protocols\mailto\shell\open\command] @="\"C:\\Program Files (x86)\\Mozilla Firefox\\firefox.exe\" -osint -url \"%1\""

Any ideas ?

Check out these Microsoft links;

http://www.microsoft.com/en-us/Search/result.aspx?q=set+default+program

I eventually found out what to do: there's only one registry key to add !

It's all explained on my latest blog post latest blog post !

It will be good if the Firefox team would add that regsitry key to the Firefox Install (Chrome does it) !

That was very good work. Well Done. Please flag your last post as Solved Problem so other will know.