You have managed to miss the memos about this? The Firebug team have
been announcing the pending changes for a while.
The restriction is a *Firefox* restriction the Firebug folks *can't*
remove. Mozilla is rolling out e10s, and Firebug doesn't *work* under
e10s. Making it work would require a ground up rewrite, and the
resources aren't there to do it.
The only options now are to use Firefox built in Dev Tools and vote
for stuff Firebug does and Dev Tools doesn't that the Dev Tools team
should add, or revert to a prior version of Firefox where Firebug
still works and stay put at that release. At some point, the latter
will no longer be a viable option.
______
Dennis
https://plus.google.com/u/0/105128793974319004519