I am developing a Firefox Add-on for Mobile and PC . I want to get the URL from all tabs in the browser, even tabs that are not loaded. Is there a way to get the URL from these unloaded tabs? To be honest, i'm not sure if i asking the question right. This is affecting Firefox on android. The browser has 961 tabs open and I can only get the URL for the active ones that have been loaded. So I have 960 "about:blank" for tab URL entries. Is there a way to get the URL from these unloaded tabs? If I select an unloaded tab and rescan the tabs, i will have 959 duplicates and 1 new entry. So it only affects tabs that have not been viewed since the application started. I have looked at browser.sessions and browser.tabs.query(). I thought maybe the tabs were being discarded and that was causing the issue but on PC if the tab is discarded I can still get the URL when I query. The mobile version is doing something with these old tabs. I don't know where to look for documentation on the feature. Thanks.