Styles are listed before actions by default. Actions are listed before
styles if `popup.stylesFirst` is false. A control for the option is shown
in "Manage" if `popup.stylesFirstUI` is true.
Two independent filters. One allows only styles that are enabled, the
other allows only styles that were written locally (that is, styles
without an update URL).
F3, Shift-F3, Ctrl-H - find/find previous/replace
Ctrl-G: go to line dialog
Alt-PgDn: next code section
Alt-PgUp: previous code section
...and many more.
