In web extensions in other browsers like Chrome, Firefox and Safari, the constant chrome.tabs.TAB_ID_NONE is set to -1. While in Orion this is set to 0. This difference leads to bugs as many developers expect tabId of 0 to be a valid tab id.
For chrome.tabs.TAB_ID_NONE to return -1.
Version 0.99.138-beta (WebKit 623.1.8.0.0)
Tahoe (26)
26