Bug 1671586 Comment 0 Edit History

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Original comment by
on 
Crash report: https://crash-stats.mozilla.org/report/index/6e2399fc-80bb-4ad6-9221-196920201016

MOZ_CRASH Reason: ```MOZ_DIAGNOSTIC_ASSERT(false) (NS_SUCCEEDED(GetPrefValue(aPref, &value, PrefValueKind::User)))```

Top 10 frames of crashing thread:
```
0 XUL void mozilla::Internals::UpdateMirror<std::__1::atomic<float> > modules/libpref/Preferences.cpp:4338
1 XUL NotifyCallbacks modules/libpref/Preferences.cpp:1682
2 XUL pref_SetPref modules/libpref/Preferences.cpp:1640
3 XUL mozilla::Preferences::SetCString modules/libpref/Preferences.cpp:4673
4 XUL nsPrefBranch::SetCharPrefNoLengthCheck modules/libpref/Preferences.cpp:2146
5 XUL NS_InvokeByIndex 
6 XUL XPCWrappedNative::CallMethod js/xpconnect/src/XPCWrappedNative.cpp:1142
7 XUL XPC_WN_CallMethod js/xpconnect/src/XPCWrappedNativeJSOps.cpp:925
8 XUL js::InternalCallOrConstruct js/src/vm/Interpreter.cpp:598
9 XUL Interpret js/src/vm/Interpreter.cpp:3335
```
**Note**
- 83.0a1 seems to be affected, 82.0 is not affected

**Steps to Reproduce**
1. Launch Firefox
2. Access about:config
3. Search for "layout.css.devPixelsPerPx" and edit the value to 1,5
Revision 1 by
on 
Crash report: https://crash-stats.mozilla.org/report/index/6e2399fc-80bb-4ad6-9221-196920201016

MOZ_CRASH Reason: ```MOZ_DIAGNOSTIC_ASSERT(false) (NS_SUCCEEDED(GetPrefValue(aPref, &amp;value, PrefValueKind::User)))```

Top 10 frames of crashing thread:
```
0 XUL void mozilla::Internals::UpdateMirror<std::__1::atomic<float> > modules/libpref/Preferences.cpp:4338
1 XUL NotifyCallbacks modules/libpref/Preferences.cpp:1682
2 XUL pref_SetPref modules/libpref/Preferences.cpp:1640
3 XUL mozilla::Preferences::SetCString modules/libpref/Preferences.cpp:4673
4 XUL nsPrefBranch::SetCharPrefNoLengthCheck modules/libpref/Preferences.cpp:2146
5 XUL NS_InvokeByIndex 
6 XUL XPCWrappedNative::CallMethod js/xpconnect/src/XPCWrappedNative.cpp:1142
7 XUL XPC_WN_CallMethod js/xpconnect/src/XPCWrappedNativeJSOps.cpp:925
8 XUL js::InternalCallOrConstruct js/src/vm/Interpreter.cpp:598
9 XUL Interpret js/src/vm/Interpreter.cpp:3335
```
**Note**
- 83.0a1 seems to be affected, 82.0 is not affected

**Steps to Reproduce**
1. Launch Firefox
2. Access about:config
3. Search for "layout.css.devPixelsPerPx" and edit the value to 1,5

Please feel free to modify the Component, as I'm not 100% sure where this needs to go

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