The minimap shows a miniature copy of the website.
If you move the mouse over the minimap, the page will scroll exactly to the spot you are pointing at.
Toggle the extension (turn on or off) clicking the extension icon (paper with a colored strip) on the top right or using the hotkey Ctrl+Shift+F (while holding Ctrl and Shift, press F) or Command+Shift+F on Mac. If the hotkey doesn't work, go to chrome://extensions/ and scroll to the bottom and click on keyboard shortcuts (to the right) to set it manually.
Notes:
After installation, the extension will work on newly opened tabs (not in the tabs that were opened before you installed the extension).
Other works
http://imagentleman.github.io
Extore is a team of professionals who are passionate about creating extensions for web browsers. This devotion also gives us opportunity to appreciate work of other people. We get inspired by useful, open source extensions made by developers all over the world. Our strong belief is that one should share helpful add-ons with others. That’s why we’d like to present you our ever-growing list of favourite extensions that have inspired us. Moreover, as you probably have already learned, sometimes struggling for the best brings an end to the good. Talking about add-ons it often turns out that an upgrade is worse then previous version. Also it can become really tricky to get back to the beloved version of your favourite extension. That’s why we’re going to make not only the latest, but all versions of our favourite (and we hope yours too) add-ons available for download. No more compromises, just stick to the version you really like!