My extension gets favicons for site using getFaviconURLForPage call and shows them using moz-anno:favicon scheme. As of FF42 this always produce 16x16 icons, but starting FF43 icons for some sites (for example bbc.com) become 32x32. I’ve looked into FF sources and found from getImageURLForResolution function (resource://gre/modules/PlacesUtils.jsm), that I probably should add “#-moz-resolution=16,16” suffix to the url, but has no luck.
Could you please suggest me how to get 16x16 favicons in FF43+ or point to appropriate bug id @bugzilla?