How hard would it be to work together with Mozilla to ship this functionality in Firefox officially? Their excuses not to work on SSB (that's what they called installing web apps to desktop) were: 1. "no perceived user benefit" and 2. "feature is costing us time in terms of bug triage". Evidently, some users and developers find mentioned feature useful, because many projects like FirefoxPWA exists. Get other projects that are trying to achieve the same goal on board (Web App Manager from Linux Mint comes to mind) and everybody wins. As an added bonus, Firefox might even increase their user base a little.