DOM Storage is a pretty inefficient and memory-hungry storage mechanism. Session Store attempts to record DOM Storage for each tab, which leads to (possibly very large) objects being serialized once to be sent from frame/content to parent and once to be sent from the main thread to the I/O thread. This is a suspect behind a number of crashes (see bug 1106264 for a discussion on the topic).
This patch limits the amount of DOM Storage that Session Restore attempts to store. We perform a quick estimate on the amount of memory needed to serialize DOM Storage and prevent storage larger than ~10M chars being sent from frame/content to the parent. Once this patch has landed, we will need to watch FX_SESSION_RESTORE_DOM_STORAGE_SIZE_ESTIMATE_CHARS to find out whether our threshold is meaningful.
Attempt to get around the fact that XP SP2 (and below) systems won't be able to
handle Authenticode signatues with SHA-2 digests by disabling the maintenance
service, the only thing on our update path that uses Authenticode, on systems
running WinXP below SP3.
This patch both prevents the service from being included in new installations,
and prevents the service from being used where it is already installed.
I tried to keep the changes to existing tests as minimal as
possible. There were a few exceptions, though:
* test_update_ignorecompat.js was completely broken. I couldn't
figure out why it was suddenly failing after I changed it to use
`add_test`, and it turned out that it had been failing all along,
but in a way that the harness didn't pick up.
* I changed most of the `do_throw` in update callbacks to `ok(false`
because it took me about an hour to figure out where the test was
failing when I hit one of them.
* I made some changes to sync `test_update.js` and `test_update_ignorecompat.js`
where one appeared to have been changed without updating the
other.
* I made `promiseFindAddonUpdates` a bit more generic, because I was
planning to convert most of `test_update.js` to use it, rather
than nested callbacks. I changed my mind a quarter of the way
through, but decided to keep the changes, since they'll probably
be useful elsewhere.
I tried to keep the changes to existing tests as minimal as
possible. There were a few exceptions, though:
* test_update_ignorecompat.js was completely broken. I couldn't
figure out why it was suddenly failing after I changed it to use
`add_test`, and it turned out that it had been failing all along,
but in a way that the harness didn't pick up.
* I changed most of the `do_throw` in update callbacks to `ok(false`
because it took me about an hour to figure out where the test was
failing when I hit one of them.
* I made some changes to sync `test_update.js` and `test_update_ignorecompat.js`
where one appeared to have been changed without updating the
other.
* I made `promiseFindAddonUpdates` a bit more generic, because I was
planning to convert most of `test_update.js` to use it, rather
than nested callbacks. I changed my mind a quarter of the way
through, but decided to keep the changes, since they'll probably
be useful elsewhere.
