LeftEditLinks.js is a user script which moves the  links for section headers so that they are close to the section headers. It was created after a discussion at the Village Pump about whether or not they should be moved for everyone, and regardless of the discussions' outcome it was determined that a gadget should be made in order to allow anyone who wanted the other version to use it.
You can most easily install LeftEditLinks as a gadget by going to Special:Preferences and selecting the "gadgets" menu. Just check the box for this gadget, click "save", purge your cache, and you're done.
Alternatively, you can add the following to your skin.js page.
This version is also used for testing, so before making any changes to the gadget version they will be visible to you if you use the direct
importScript() function. However, there may be times where the script doesn't work for you if I am working on making changes to it. The gadget version usually makes the most sense.
If you notice any bugs, including browser or skin compatibility issues, please feel free to post them here. When you do please indicate what web browser and skin you are using.