Firefox accessibility.typeaheadfind is triggered for multikey shortcuts.

For multikey shortcuts Firefox accessibility.typeaheadfind is triggered.  Returning false will cause the default event from occuring and prevent the event from bubbling up.
Merge pull request #307 from wltb/master

Feedparser: Add important check for unknown feed type detection
make language detection optional (closes #779)
Merge pull request #301 from derekschrock/patch-1

Firefox accessibility.typeaheadfind is triggered for multikey shortcuts.
Revert "Firefox accessibility.typeaheadfind is triggered for multikey shortcuts."

breaks copy/paste in chrome

This reverts commit d7e4897b8ee6506ececf0a3bd4aa7c44c4dc4c6a.