Expedia broken
Use of Expedia.com (to search for hotels or flights, for example) breaks when HTTPS Everywhere is enabled. On my installation v3.5.3 (and many versions before) Expedia is shown as active on HTTPS dropdown with a red 'refresh' circle icon next to it. (Not sure what that icon means vs the others.) Regardless, when actions like hotel or flight search are performed the results pages break with no entries. Turning off HTTPS for Expedia.com solves the problem. This trouble ticket applies with Firefox v31(windows). My HTTPS-E version is 3.5.3 which isn't on ticket selection list.
REPRODUCTION: Go to expedia.com and search, for example, on New York hotels staying next weekend. Results page will be empty. Redo search with expedia.com disabled on HTTPSE (red X icon) and it will work.
SOLUTION: Barring Expedia.com changing anything it would appear that Expedia.com needs to be removed from the list of enabled sites by default.