The rocker gesture like the left-click is mounted while pushing right-clicking.
The operation related to the tab and the window can be done by the following actions.
･The left-click pushing the right mouse button.
･It right-clicks while pushing the left mouse button.
If it is not a page (Or, rereading was seen) read after this extension was installed, it doesn't operate.
Even as for version 1.0.5, the context menu was not displayed.
(This translated on the translation site.)