On Thursday, January 7, 2021 at 7:07:05 PM UTC+1, Doug Thayer wrote: > On 1/7/2021 4:18 AM, Sebastian Zartner wrote: > > > On Wednesday, January 6, 2021 at 10:55:22 PM UTC+1, Doug Thayer wrote: > >> On 1/6/2021 1:51 PM, Mike Hommey wrote: > >> > >>> On Wed, Jan 06, 2021 at 01:46:52PM -0800, Doug Thayer wrote: > >>>> On 1/6/2021 1:44 PM, Mike Hommey wrote: > >>>> > >>>>> On Wed, Jan 06, 2021 at 01:30:00PM -0800, Doug Thayer wrote: > >>>>>> On Wed, Jan 6, 2021 at 1:23 PM Mike Hommey <m...@glandium.org> wrote: > >>>>>> > >>>>>>> On Wed, Jan 06, 2021 at 11:57:18AM -0800, Doug Thayer wrote: > >>>>>>>> If you don't spend any time on Nightly in Windows 10, please feel > >>>>>>>> free to > >>>>>>>> disregard this. > >>>>>>>> > >>>>>>>> tl;dr: we're sometimes creating the first window differently than > >>>>>>>> usual, > >>>>>>> so > >>>>>>>> be on the lookout for breakages. > >>>>>>>> > >>>>>>>> On 2021-01-05, a change landed in Nightly which enabled the pre-XUL > >>>>>>> skeleton > >>>>>>>> UI [1]. This is a feature which allows us to create the first window > >>>>>>>> and > >>>>>>>> populate it with a non-interactive placeholder UI before we load > >>>>>>> xul.dll. On > >>>>>>>> some systems, this can mean we can give visual indication of Firefox > >>>>>>>> launching as much as 15 seconds sooner than normal (loading xul.dll > >>>>>>>> can > >>>>>>> take > >>>>>>>> a while). We're hoping this could be a big win for users who > >>>>>>>> experience > >>>>>>> very > >>>>>>>> slow startups, and we also hope it will improve the overall > >>>>>>>> snappiness of > >>>>>>>> startup even on fast systems. > >>>>>>> What does the placeholder UI look like? > >>>>>>> > >>>>>> Colors and layout can vary, but the basic look is this: > >>>>>> [image: image.png] > >>>>> The image attachment didn't quite work. > >>>> Woops. Here is a link: https://i.imgur.com/R4ynXW5.png > >>> Does the placement and the size of that window vary? > >> It does. It uses values persisted to the registry based on the most > >> recent run of the default profile, scoped by the path to the executable. > >> The registry values can be found at > >> HKEY_CURRENT_USER\SOFTWARE\Mozilla\Firefox\PreXULSkeletonUISettings. > > I am running Nightly 86.0a1 (2021-01-07) 64bit on Windows 10 on a freshly > > created profile and checked that the browser.startup.preXulSkeletonUI > > preference is set to true, though instead of seeing the UI I get a blank > > white window. I remember, I tested this feature like a month or two ago and > > it did work before. Is that expected? If not, please let me know what > > information is needed to track this down and I'll file a bug for it. > It could be expected. It's probably worth having some kind of disabled > reason listed somewhere at some point. For the time being, I'll > enumerate a few ways that this could get automatically disabled: > > 1) You could be running firefox.exe with command line arguments. We have > a finite list of command line arguments which are approved - if we see > anything outside that list we disable the skeleton UI. This covers, for > example, launching the profile manager, which is of course a window that > looks nothing like the typical main browser window. The list of approved > command line arguments is defined in code here: > https://searchfox.org/mozilla-central/rev/519f913527b0d9d5097d290d5731cff6b2991fe0/mozglue/misc/PreXULSkeletonUI.cpp#1570 >
That was it. Thank you for the detailed hints! As I wrote before, I tried it on a fresh profile. And I called it via `-p test` from the command line. And my normal Nightly profile is called via `-p nightly`, so that's why I didn't see it. Without it it works. Would be nice if it worked with different profiles, though. Anyway, congratulations again! Sebastian _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
