For some reason cache entries are not always visible. STR: 1. Go to http://people.mozilla.org/~mratcliffe/appcache/ and allow the cache to be saved. 2. Go to about:cache. 3. Click "List Cache Entries" under the Offline cache device. 4. In the list of cache entries that appear click: http://people.mozilla.org/~mratcliffe/appcache/page1.html 5. The following message will be displayed: "The cache entry you selected is not available." Other browsers have no problem displaying the correct information.
This doesn't really block 831720 but this appcache entry bug will be much more visible when it lands as cache entries can be viewed from the Firefox command line.
I can't see the entry info for any of the cached entries in my list right now. Tried different domains and all of them return this message: Cache entry information The cache entry you selected is not available. Still happening on Nightly 20140206 (Firefox 30).
We are going to break about:cache* soon anyway. Future plan is unclear right now. Watch Bug 916052.