Part 1: backend - added removeDatabase method to the actor. As there are no change events in indexedDB we could listen to, we need to update the hostVsStores map and send the "deleted" event to UI directly in the method. - added removeDB method to indexedDBHelpers. This method does the heavy lifting, in the process script. - the "patchMetadataMapsAndProtos" function is not part of the child-parent API, doesn't need to be assigned anywhere in the maybeSetupChildProcess call. Part 2: Bugfix in the TreeWidget - when a last child of a tree item is deleted, it shouldn't have the expander arrow anymore. Added code that sets the "empty" attribute on the parent item, plus test. Part 3: Frontend UI - added new delete action to the tree context menu, show it on an indexedDB database tree item - fixed the handleDeletedItems method, so that it can handle removing a whole database from the tree Part 4: Mochitest

Fixed return value of removeDB - make it work both in e10s and non-e10s mode.

Try run is 100% green, requesting checkin. There are parts 1 to 4, but order shouldn't matter.

Sorry, meant to add the keyword to bug 1231449. Sebastian

(In reply to Sebastian Zartner [:sebo] from comment #10) > Sorry, meant to add the keyword to bug 1231449. Both frontend and backend were implemented as part of this bug, marked bug 1231449 as duplicate. Adding the dev-doc-needed keyword here. Sorry for the confusion.

https://hg.mozilla.org/integration/fx-team/rev/a7a25d56bd3a https://hg.mozilla.org/integration/fx-team/rev/937b169893c1 https://hg.mozilla.org/integration/fx-team/rev/4e204ca5848c https://hg.mozilla.org/integration/fx-team/rev/38b63eafc2ca

https://hg.mozilla.org/mozilla-central/rev/a7a25d56bd3a https://hg.mozilla.org/mozilla-central/rev/937b169893c1 https://hg.mozilla.org/mozilla-central/rev/4e204ca5848c https://hg.mozilla.org/mozilla-central/rev/38b63eafc2ca

Works fine for me on http://blog.vanamco.com/indexeddb-fundamentals-plus-a-indexeddb-example-tutorial/, but fails to properly handle the case when the DB is blocked. Created bug 1268460 to handle this. Added documentation for this at https://developer.mozilla.org/en-US/docs/Tools/Storage_Inspector#IndexedDB and a release note at https://developer.mozilla.org/en-US/Firefox/Releases/49. Sebastian