Quoting Nicolas in [1]:
> We now have a way to display the border of layers, which is useful to
> have an idea of how a webpage is split in different layers. The way
> content is layered has perforance/memory impacts so it is sometimes
> useful to see how a given web page is layered.
>
> In order to see layer borders one just needs to set the pref
> "layers.draw-borders" to true. It works on platforms that use OMTC,
> that is fennec and B2G at the moment.
>
> This debug pref should be exposed in b2g's settings just like paint
> flashing is.
Good news, it is now exposed! Take a look at [2] to see how it looks.
Even if the setting is always displayed in Gaia, you'll need to use
mozilla-central to actually see the borders.
[1] https://bugzilla.mozilla.org/show_bug.cgi?id=873972
[2] https://bug873972.bugzilla.mozilla.org/attachment.cgi?id=755397
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