Switch Planner mode helps prepare for your site's switch to HTTPS by generating a report of external HTTP resources that might not yet be available on HTTPS.
After enabling, navigate around your site and try to exercise all functionality in order to get a comprehensive list of external resources.
For each group of resources listed as "Unrewritten," find out whether they are available on HTTPS. If so: add a rule to HTTPS Everywhere! If not: try to make them available over HTTPS or use a different resource or provider. Otherwise your site will generate Mixed Content (passive or active) errors when you turn on HTTPS.
For most accurate results, disable ad blockers before using. Closing this panel will deactivate Switch Planner mode and clear stored data.