Thanks for your review.
I think I may not have been able to explain correctly.
There are GET request to
versioncheck-bg.addons.mozilla.org for system addons (due to update check), which is of no use as we update system addons with different process and eventually leads to warnings mentioned in #1353934.
Please see the attachment. There are Requests to update system addons for example.
Since there is no update URL in
email@example.com it request update from URL in
This return a blank object and hence the warning is generated as mentioned in #1353934.
The fix for this would be as simple as adding
if (addon.signedState === AddonManager.SIGNEDSTATE_SYSTEM) continue;
just when loop starts at https://searchfox.org/mozilla-central/source/toolkit/mozapps/extensions/AddonManager.jsm#1286