As you may know, we are in the process of rolling out some new enhancements to the Asana UI as outlined in Introducing our new Spreadsheet-Inspired List View!
In addition to Increasing the limit of "important" custom field settings per project, we wanted to point out that this update will include other differences in how the list view and task pane is structured visually, which may cause breakages to apps that rely on reading the page structure of Asana. For example, browser extensions that read or inject UI.
The Asana web user interface is not a part of our developer platform and is an area that constantly undergoes change and evolution as we listen to feedback from customers. As such, we recommend against building apps that rely solely on the existence of certain UI elements. If you do own such an app, it may require some maintenance to continue to function correctly over the next few weeks.