[hackalaugh]

The lack of xpath support is an issue to me. Why doesn't FF have xpath support? Chrome and Firebug have/had this.

[nachtigall]

You mean this https://bugzilla.mozilla.org/show_bug.cgi?id=987877 ?

You might want to leave a comment on how/why (use case) you used it to help to priorize the bug.

There's a Firebug Gaps meta bug which depends on this: https://bugzilla.mozilla.org/show_bug.cgi?id=991806