Created attachment 8682756 [details] Snapshop of the two different sizes reported. User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:42.0) Gecko/20100101 Firefox/42.0 Build ID: 20151029151421 Steps to reproduce: Asked for informations on the same image once in http and once in https. Actual results: The file size reported for https://abs.twimg.com/a/1446304541/img/t1/web_heart_animation.png is not the same as for http://abs.twimg.com/a/1446304541/img/t1/web_heart_animation.png In https the reported size is 11583 bytes, in http it is 11695 bytes, the download file is actually 11695 bytes. Expected results: Always report 11695 bytes.
Can you still reproduce the issue? Both images are reported as 11695 bytes here (Firefox 42.0 on Windows 8.1).
It's a temporary cache issue. I was able to reproduce it, then I trashed the browser cache and it's gone.
Component: Untriaged → Networking: Cache
Product: Firefox → Core
Status: NEW → RESOLVED
Last Resolved: 3 years ago
Resolution: --- → WORKSFORME
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