A Methodological Framework for Porting Google Chrome Extensions to Mozilla Firefox: API Compatibility and Manifest V3 Considerations
The manifest.json file acts as the configuration blueprint. The transition from Manifest V2 (MV2) to Manifest V3 (MV3) has introduced significant friction. convert chrome extension to firefox
| Chrome API | Firefox Equivalent / Fix | |------------|--------------------------| | chrome.* | browser.* (Firefox supports both, but browser.* is promise-based) | | chrome.declarativeNetRequest | Limited; prefer webRequest + blocking (MV2) or adjust rules | | chrome.identity | browser.identity (similar) or web-ext OAuth redirect | | chrome.storage.local | Identical (supported) | | chrome.cookies | Identical | | chrome.tabs.query | Identical | | chrome.runtime.sendMessage | Works; cross-browser messaging via browser.runtime.sendMessage | convert chrome extension to firefox
// Use this to support both chrome.* and browser.* function getBrowser() window.chrome; convert chrome extension to firefox