Constant BROWSER__BFCACHE__NOT_RESTORED_REASON_COUNT 

pub const BROWSER__BFCACHE__NOT_RESTORED_REASON_COUNT: &str = "browser.bfcache.not_restored_reason_count";

The number of reported reasons a page was not restored from the back/forward cache on a back/forward navigation. 0 when the browser reported no reasons (e.g. non-Chromium browsers).

• Scrubbing: Manual
• Rewriting behavior: None