Chrome: Rearrange Tabs lets you move your Chrome tabs around an open window with keyboard shortcuts. It's fairly simple, and a nice way to organise them if you have a ton of tabs open. The default shortcuts are good, but if you don't like them, you can customise them and add your own.
Once installed, Ctrl+Shift+Left in macOS or Shift+Alt+Left in Windows will move tabs to the left of the current Chrome window. Use the same keystrokes and the right arrow to move tabs to the right. If you'd prefer your own shortcuts, you can overwrite the defaults in the extension's settings page. That's all there is to it, and the add-on works with pinned tabs as well. Grab it from the Chrome Web Store below.
Rearrange Tabs [Chrome Web Store]