Keyboard Shortcuts
On Mac, you can use Command + B to open or close tabsets when you are working in your browser, and you can use Command + K to focus on the search input field. With the OpenTab Features enabled, you can use Alt-Left and Alt-Right to switch back and forth in your tab history.
For Windows, the respective shortcuts are Ctrl-B, Ctrl-K and Alt-Left and Alt-Right.
The shortcuts are active on every page you visit, unfortunately it is not possible to deactivate them depending on the URL you are currently visiting.
If you want to change or disable one or more shortcuts, you can open chrome://extensions/shortcuts and change the defaults. On Firefox, go to about:addons, then chose tabsets, click on "Manage" in the context menu, and again on "Manage Extension Shortcuts" in the settings.