Bug 853350 requires a bunch of engineering and product work to fully resolve. In the short term we can tweak SQLite pragmas on mobile devices to get a little more space back when we delete things from indexedDB databases. We can also get a little speed boost by leaving 0-size .sqlite-journal files on disk rather than deleting them. Attached patch requires the patches from bug 857376 to land, but that should be happening as soon as the tree reopens.

This is nearly identical to the m-c patch, only real difference is that page_size is hardcoded since we decided not to do anything fancy on b2g18 in bug 858674.

Filed bug 858680 on figuring out a long-term solution involving full VACUUMs for indexedDB.

Given that we don't have still any progress with bug 853350 I think landing this makes sense

Backed out for Windows bustage. https://hg.mozilla.org/integration/mozilla-inbound/rev/99cfae75ee7c https://tbpl.mozilla.org/php/getParsedLog.php?id=21556769&tree=Mozilla-Inbound

https://hg.mozilla.org/integration/mozilla-inbound/rev/e0553df9a3be with r=khuey on the (tiny) change.

Your b2g18 patch is going to need updating for the Windows bustage too...

Updated patch for mozilla-b2g18.

https://hg.mozilla.org/releases/mozilla-b2g18/rev/b876371dc011 https://hg.mozilla.org/releases/mozilla-b2g18_v1_0_1/rev/a5d3be0e028d