Hi, Required add-on signing for extensions is new in Firefox version 43. Back in February 2015 [https://blog.mozilla.org/addons/2015/02/10/extension-signing-safer-experience/ it was announced] that, for a safer add-on experience, all extensions will have to be verified and signed by Mozilla before they can be installed. More insight into that decision is contained in Mozilla's [https://blog.mozilla.org/addons/2015/04/15/the-case-for-extension-signing/ April 2015 blog post]. Extensions hosted on addons.mozilla.org are automatically signed. If an extension you wish to use is distributed by a third-party, it must be signed before you can install it. Unsigned extensions that you have already installed will be automatically disabled. Please ask the add-on developer or vendor if an updated and signed version of the add-on is available. You can also visit addons.mozilla.org to see if there's a signed version of the add-on you can install. <!--FOR contributors, if there is a specific situation where it is absolutely needed they can add this about:config entry xpinstall.signatures.required and set it to false. Please warn them that this will cause a security risk in their browser this option will go away in futured version; see here: [quote]Currently targeting Signing with no pref to turn off in Firefox 47.[/quote] https://wiki.mozilla.org/Firefox/AddOns/Status/Updates and https://mozilla.aha.io/published/0d49e74c6853d3d721010bd9d4f67f34?page=2 ...so this might need to be removed--> This signing requirement is mandatory in regular release and beta versions of Firefox. For testing purposes, it will still be possible to configure Firefox Developer Edition and Nightly versions to run unsigned extensions. For more information, please see [[Add-on signing in Firefox]] and [https://wiki.mozilla.org/Add-ons/Extension_Signing]. You can visit the [https://groups.google.com/forum/#!forum/mozilla.addons.user-experience mozilla.addons.user-experience] group to further discuss add-on signing.

Firefox for iOS does not have a feature to create an icon on your iOS device home screen. However, if that feature did exist, and you were to save a shortcut to a web page on the home screen, iOS would automatically open the site in Safari. So that wouldn't really help you. One workaround would be to set a home screen to be displayed when you open Firefox for iOS and tap the Home icon (this might be new in version 5.0, released this week). Please see this article for steps: [[Set a homepage in Firefox for iOS]]. Actually, that might not be any faster than using the tiles for frequently visited sites...