## BaseWebExtensionColl<T> class Base class for [`TaskPaneCollection`](../taskpanecollection/), [`WebExtensionBindingC`](../webextensionbindingc/), [`WebExtensionProperty`](../webextensionpro...... ```csharp public abstract class BaseWebExtensionColl<T>...collection of web extensions. ```csharp Document doc = new Document(MyDir...