User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:44.0) Gecko/20100101 Firefox/44.0 Build ID: 20160123151951 Steps to reproduce: -Load a page that creates many LocalStorage items (e.g. the test URL provided). -Open LocalStorage inspector. Actual results: Some keys are missing from the list; this can easily be verified using the test URL, as the numbering of these keys should be consecutive. Scrolling brings additional key/value pairs into the list, but these may be both above or below the current viewport. This causes confusion: are these keys currently hidden, or are they not present in LocalStorage at all? The only way to be sure that all keys are present in the list, is to scroll down the entire range of all keys first, and then scroll up again. Expected results: When sorting on "key": when two keys are visible, then all intermediate keys should be visible as well. When sorting on "value": when two values are visible, then all intermediate values should be visible as well.

Dupe to bug 1171903?

Not a dupe. Bug 1171903 was about at most 50 items being shown at all, and was fixed by making more available through "endless scrolling". This bug is about the random ordering of keys after adding endless scrolling, resulting in gaps in the sequence of keys (or values).

Filter on Brobdingnagian.

This was fixed by bug 1073967