None of this data is accessed beyond the needs of the features of the extension and no personal data is sent from the extension to a third-party apart from for the third-party features such as validators. Why does the extension need access to all my browsing history and private data This is a standard message shown by Chrome (!category-topic/chrome/give-feature-feedback-and-suggestions/f5sdbSD92C8) that indicates that the extension has full access to all the users data on all web sites in order for all of its features to work. The reset disable features feature under the Disable tab can be used to reset the settings to their defaults, but note that this resets all of the settings that can be changed under the Disable tab. Therefore if notifications have been previously disabled and are now enabled then the extension can only set them to be enabled for all sites.

When enabling a disabled feature the APIs only allow the extension to set a less restrictive setting and not reset the setting entirely. These are the same languages that developers develop websites with, but browser extensions are much faster, safer and better. Why does the extension now allow notifications on all sites This is a limitation of the chrome apis used for the disable features. This is the official port of the Web Developer extension for Firefox. The web developer extension adds a toolbar button to the browser with various web developer tools.

Chrome addons for developers