I am not sure. It is probably an Android question rather than a Firefox one. With my phone I get the option what I use and where to set that as just once or everytime. As far as Firefox Desktop is concerned there is this help article: * [[Change the program used to open email links]] Also see this article (I picked articles at random off the internet) * [[Make Firefox the default browser on Android]] Instead of looking for and changing Firefox or the browser look in default apps to see what is set to handle mail. See also this article for Marshmallow onwards * http://www.tomsguide.com/us/change-default-apps-in-android,review-3309.html Or for lollipop * http://www.phonearena.com/news/How-to-change-default-apps-browser-mail-camera-etc-on-Android-5.0-Lollipop_id66446 Note you may need to resort to clearing all settings or using another third party App to control the settings. This is a test link for you to try with mailto:test@example.com

thanks john, that's a good point about it being an android issue because when i am on my pc, firefox selects yahoo automatically and flawlessly. i will research it.