Firefox doesn't handle chained deadkeys on Windows
It seems that Firefox doesn't handle chained deadkeys as produced by for example this layout http://blogs.msdn.com/b/michkap/archive/2011/04/16/10154700.aspx . Correct characters are not produced as in contrast with them being produced in Windows explorer.
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For those whose eyes might glaze over when reading that blog post, can you give an example of a key sequence that produces the desired character or comment command in Internet Explorer but not in Firefox?
jscher2000 - Support Volunteer modificouno o
Example of a sequence is OEM_7 + OEM_7 + o producing ő (you have to have the layout from the example, I'm not sure if there is a standard layout containing chained deadkeys). Also note that it works in Explorer (like Start Menu or searching on Windows) rather than in Internet Explorer.
I have found an installer of a layout containing chained dead keys: http://www.kbdedit.com/manual/examples/KbdEditInstallerUSChainedDeadKeyMultiAccent.exe
You can produce ő by sequence (ACUTE, ACUTE, o), where ACUTE is AltGr+OEM_7.
Drekin modificouno o
I think it will be hard to get clear answers about custom keyboard layouts here...
I did see a bug that sounds related: 791300 – Dead-key diacritics non-functional in text forms and address bar -- the last comment mentions a code comment that chaining is not supported.
About the bug tracking system: