Add regular expression support to FF/TB "about:config" search field.

[rhpuckett3]

Add support for regular expressions in the Firefox / Thunderbird "about:config" search field.  It would be helpful to be able to view groups of dis-similarly named preferences at once for debugging or setting before profiling.  [ Unless it already supports this and I've missed it... 🙂 ]

[Jon]

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[Honza]

Thank you for reaching out, I love the idea.

I search our bug trackers and it seems to be reported here:

https://bugzilla.mozilla.org/show_bug.cgi?id=1556385

Honza