Running a set of tests to capture performance information and bugs. GUI related issues like font size, alignment, display images etc.
Comparing web or mobile application performance with respect to industry standard which is given by some other apps.
Verify defect fixed previous bugs is now working correctly or not! Filter High / Low Severity and High / Low Priority of bugs.
Communicate with development team and sort out all bugs and make sure its fixed properly in all browsers and devices.
Generate bugs reports of each and every pages, modules, projects and keep history for the same.