In the above code sample, notice that the onBrowserConnected and onBrowserDisconnected methods both take a browser object as an argument. This object is the Dolphin browser that’s running on the device, that loads your Add-on by declaring an Android intent.
Your Add-on uses this browser object to interact with the Dolphin browser and/or webpages displayed in the browser.
Accessing the browser
A few quick notes about the browser object:
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To get the browser’s PID (process ID), call browser.getBrowserPid()
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To use the browser object in other parts of the Add-on app, such as Activity, use the browser’s PID. Call AddonService.getInstance().getBrowser(int pid)
The API version
To find out the Dolphin API version, call Browser.getApiVersion(). This allows the Add-on to take advantage of new features as they are added to the API, while maintaining backward compatibility to earlier API versions.