Firefox is not automatically set as the default web browser if the browser is opened in Windows 8 compatibility mode
Categories
(Firefox :: Shell Integration, defect)
Tracking
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| Tracking | Status | |
|---|---|---|
| firefox89 | --- | unaffected |
| firefox90 | --- | unaffected |
| firefox91 | --- | affected |
People
(Reporter: mcoman, Unassigned)
References
Details
Attachments
(1 file)
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1.95 MB,
image/gif
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Details |
rec of the issue.gif
[Affected versions]:
- Firefox Nightly 91.0a1 - Build ID: 20210630093648
[Affected Platforms]:
- Windows 10 x64
[Prerequisites]:
- Have the browser set to be opened in Windows 8 compatibility mode.
- Firefox is NOT set as the default web browser.
[Steps to reproduce]:
- Open the browser with the profile from prerequisites.
- Navigate to the "about:preferences" page and click the "Make Default..." button.
- Observe the behavior.
[Expected result]:
- Firefox is automatically set as the default web browser.
[Actual result]:
- Firefox is not set as the default web browser and the "Default apps" OS window is opened.
[Notes]:
- This issue is reproducible regardless of the method used for setting the browser as the default one.
- Attached a screen recording of the issue.
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Comment 1•3 years ago
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That's because AppConstants.isPlatformAndVersionAtLeast is tricked by the compatibility mode. In C++ code, IsWin10OrLater should be used which is immune to the compatibility shim. Is IsWin10OrLater exposed to JS?
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Comment 2•3 years ago
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(In reply to Masatoshi Kimura [:emk] from comment #1)
That's because
AppConstants.isPlatformAndVersionAtLeastis tricked by the compatibility mode. In C++ code,IsWin10OrLatershould be used which is immune to the compatibility shim. IsIsWin10OrLaterexposed to JS?
I don't think IsWin10OrLater is exposed to JS. In my opinion we don't need to work around compatibility mode here: it should be rare, the fallback still behaves as expected, and I don't want to get into the business of second-guessing compatibility mode. This is slightly more WONTFIX than INVALID, though, if it's more important than I know please reopen.
Description
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