New Features in Ver 4.1

・Features
　・Choice of Search Engines
　　Search Engines can be disabled individually.
　・Shortcut key for toggling
　　Now you can set a shortcut key for toggling.

・Others
　・For Developers
　　Refactor code.

New Features in Ver 4.0

・Features
　・User Agent
　　Changing the user agent is available. This feature requires a host permission. Open the options page and enable the host permission to enable this feature. This feature effects all pages of extensions which you have installed.
　・Text Selection
　　Text selection in the sidebar is enabled.
　・Support scrolling on DuckDuckGo
　　Scroll bar is enabled on DuckDuckGo in the popup.

・Others
　・For Developers
　　Refactor code.

New Features in Ver 3.0.1

・Features
　・Permission
　　Change the permission for running a shortcut. Thus, this extension requires no permissions again.

New Features in Ver 3.0

・Features
　・Options
　　You can decide behavior of the icon in the toolbar by choosing options. The default is 'Reload', this reloads the page in the popup. Another option is 'Go back to Home', this replaces the page of the popup with the home of search engines. However, a tutorial replaces the page if you have chosen 'ask' option.
　・Additional search engines by a user
　　Users can add a search engine in a options page. Also you can choose the site as a default a search engine. YouTube, Amazon, MDN, ... so many sites can be used.
　・Shortcut
　　Users can search with a shortcut key. The default is "Ctrl+Alt+P". The shortcut key can be edited (refer to this link). This feature requires an additional permission.
　・Search Engine Icon
　　An icon of a search engine including an additional search engine is displayed in the context menu.

・Others
　・For Developers
　　Unify a format of br tags.
　　Fetch API replaces XmlHttpRequest.
　　Reduce number of times of reading json files.
　　Refactor code.

New Features in Ver 2.1

・For Developers
　Fix the issue that the name of the extension is wrong in some files.