I noticed that Firefox comes with Yahoo and Gmail emails as the default mailto options in the Firefox settings application section. I use Outlook webmail, so I’m looking to create an extension to add the Outlook webmail to the options, but I don’t know how.
I know you can really easily create new search engines for Firefox, so I would assume that creating a mailto option wouldn’t be difficult and would probably run along the same lines.
Last time I checked, neither Outlook nor Yahoo behaved correctly when sent the mailto: parameters in the format Firefox uses. So best I could do was right-click integration:
Otherwise, feel free to adjust that one to meet your needs. It’s very specific to Outlook email, but you should be able to adapt it to suit your needs.
I’m not sure what you mean by “share”? The links to the extensions’ source code repositories are on the left sides of my pages on the Add-ons site (“Homepage”).