HelpLine is a useful Chrome add-on developed by Toshiyuki Masui that allows users to search for personal help information directly from the omnibox. With HelpLine, users can easily access their own help documentation by simply typing "/ " (slash and space) in the omnibox.

The add-on works by storing help text strings in a Scrapbox page. Users can write help descriptions in the format "? Description about xyz" within the Scrapbox page, and then press the HelpLine button to load this information into Chrome's database. Once loaded, users can search for their own help information by typing the desired keyword in the omnibox.

What sets HelpLine apart is its ability to register help text strings even when users are browsing pages outside of Scrapbox. When users press the HelpLine button while viewing a non-Scrapbox page, a dialog box appears, allowing them to register new help text strings.

HelpLine is a free add-on that falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. With its convenient and user-friendly interface, HelpLine is a valuable tool for Chrome users seeking quick access to their own help documentation.