ImTranslator extension includes the Context menu which is accessible on the click of the secondary mouse button.
The Context menu provides access to the translation applications and menu items:
When selecting text for translation, the Context menu changes to the following view:
Customize Context Menu
You can customize the context menu to remove some of the items you don't want to see in the context menu. You can also completely disable the context menu. Just uncheck unwanted items and click Save options.
Open Advanced Options and uncheck unwanted items.