User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:66.0) Gecko/20100101 Firefox/66.0

Steps to reproduce:

Hello,

With update from 66.0.2 to 70.0 I'm surprise the bar title is without text !!
I'm using with Mac OS X 10.9.5 !

Thierry from France

OS is not "macOS" !!! "OS X 10.9.5" (Mavericks)

:spohl since you fixed bug 1402577, maybe you'd be interested in this.

(In reply to Thierry from comment #1)

OS is not "macOS" !!! "OS X 10.9.5" (Mavericks)

This bug tracker's Mac OS X platform option has been renamed to macOS. Mozilla also refers to versions prior to 10.12 as macOS, like on the system requirements page.

It is very important with different "OS X" and "macOS" !!! Really sorry !!

Firefox 69 shows the title in the title bar when it's enabled.

Firefox 70 on Windows 7/10 shows the title in the title bar when it's enabled.

This is very likely to be a regression from CoreAnimation.

No title with 73.0.1... encore :(

No title with 74 ! (OSX Mavericks)

Precise : only on popup ! Bug appears on 78.1.0esr... Title is of course appears in simple window, not in any popup (ok was in Firefox Quantum 66) ; example http://astrophoto.free.fr/calculs/ and click on button [Jour&Nuit]

no title in bar of this popup but find in menu "Fenêtre (Window)" sorry I'm french and my english is approximativ :(

Bon, je comprend votre incompréhension :)

Dans la capture d'écran, je démontre le problème qui survient depuis une mise à jour depuis 66...
Mon problème est de ne plus voir dans la barre de titre le texte qui devrait apparaître. Celui dans
mon exemple montre ce que "voit" Firefox '78.1.0esr' depuis le menu 'Fenêtre', texte qui devrait
apparaître dans la barre de titre du popup. Problème vu depuis mon iMac avec OS.X (Mavericks)
et donc Firefox '78.01es' ... je voudrais retourner vers FF 66.0.2 mais la mise à jour semble être
désormais imposée ???

Bien cordialement,

Thierry

Hi Thierry, we prefer if you write bug reports and comments in English. We are understanding of the fact that English isn't everyone's primary language and we can usually navigate bug reports and comments, even if the English isn't perfect. I happen to have understood your comment in French, so let me try and respond:

We understand your bug report and that window titles appear to be missing on macOS/OS X 10.9. As pointed out in comment 7, this bug is most likely caused by our switch to CoreAnimation.

We have seen other bug reports regarding CoreAnimation and macOS/OSX 10.9. From bug 1592188 comment 6 for example:

This only affects 10.9. Versions 10.10 and above are unaffected.

This is an intentional effect from this patch: https://hg.mozilla.org/integration/autoland/rev/7711755e979e

Quoting from the commit message:

This introduces a visual regression on 10.9: context menus and panels now no
longer have a shadow. Only 10.10 and above support shadows on transparent windows
that use CoreAnimation; 10.9 is not able to obtain the shadow shape on those
types of windows.
I think this is an acceptable regression to take. We want to use CoreAnimation
for all window types because it simplifies the code (no need to handle two
paths) and because it avoids expensive mode switches if we realize too late
that a window we just opened is supposed to use CoreAnimation.

And from Matt's review:

It looks like 10.9 is currently the oldest version of OSX that we have users on (i.e, the next to be gone entirely), and currently has ~3.8% of our total OSX users. Losing shadows on context menus and popups for that small group seems totally fine to me in exchange for simplicity.

Similar to the visual regression with context menus and panels, the missing title in the title bar is equally acceptable given the fact that 10.9 is the oldest version of macOS/OS X that is currently supported, with a small number of users remaining on this version. Therefore, I will go ahead and close this bug as wontfix.

(In reply to Thierry from comment #13)

je voudrais retourner vers FF 66.0.2 mais la mise à jour semble être
désormais imposée ???

Downgrading Firefox is not usually recommended, not least due to security concerns. If you would like to proceed anyway, you can find instructions here:
https://support.mozilla.org/en-US/kb/install-older-version-firefox

Merci pour le retour d'information et je comprends la situation du développement.