Btools is a Chrome add-on developed by imba久期 that aims to optimize Bilibili and enhance the user experience. With convenient and quick functionalities, this add-on offers several features to improve the overall browsing experience on the Bilibili website.

One of the key features of Btools is the ability to view invalid videos in Bilibili collections. When enabled, the add-on automatically displays the invalid videos in your collection and allows you to search for them based on their titles. It's important to note that this feature cannot restore the videos, as they may have been deleted or made inaccessible by Bilibili.

Another useful feature is the Live Assistant, which offers various options to enhance your live streaming experience. You can hide the PK score window to avoid obstructions while watching videos, hide the mini player when it becomes distracting, or enable the blind mode to listen to audio only.

Btools also includes a feature called European, which allows users to participate in Bilibili's repost lottery. Unlike the official feature that is limited to certified users with over 10,000 followers, European enables everyone to participate, although it may not be as feature-rich as the official one.

Other features of Btools include the ability to retrieve URLs from restricted articles, obtain video covers from various Bilibili sections, automatically load Weibo comments without clicking the "Load More" button, and more.

Please note that Btools is a free add-on and can be found on GitHub for installation.