Tabs on chrome:// pages (New Tab, Settings, Extensions) are excluded by design — Chrome does not permit extensions to manage these pages. For regular website duplicates, open Settings → Advanced and make sure Smart duplicate detection is toggled on. This enables URL normalization, which catches duplicates that differ only by tracking parameters or fragments.

Check that your whitelist entry matches the site correctly. Domain entries must match the hostname exactly — use notion.so, not https://notion.so. For complex or variable URLs, use a regex pattern such as /notion\.so/. Open Settings and verify the entry shows the correct domain or regex badge. If it shows an error, the entry was not saved.

Confirm that Auto Suspend is toggled on in Settings and that the suspend time is set to a value between 1 and 480 minutes. Note that pinned tabs and tabs currently playing audio are never suspended, regardless of settings. Also check that the site is not on your whitelist.

This usually means the extension's background service worker has stopped running. Go to chrome://extensions, find Dr.Browser, and click the refresh icon. If the issue persists, toggle the extension off and back on. Chrome may terminate background workers after extended idle periods — this is a Chrome behavior, not a bug.

The system.memory permission may not be granted, or your system returned an empty value. Try disabling and re-enabling the extension. If the issue persists, this is a Chrome API limitation on some configurations and does not affect any other feature.