Hi, the download buttons script doesn't require any editing (only the Tumblr savior-like one does). It doesn't matter what skin you're using or whether or not you're logged in either.
To check that the script is installed properly and enabled, go to a page like http://archiveofourown.org/*works* where the * can be anything (anything that produces a non-404 page). Then in your Firefox toolbar menu go Tools -> Greasemonkey. The submenu that opens should have "ao3 download buttons" listed below the divider, with a little bullet or checkmark or whatever to show that the script is enabled. (Clicking the bullet/checkmark will toggle the script on or off, although the effects of toggling it won't show up until after a page refresh).
If you don't see it in that submenu it is either not installed or not being applied on the correct pages. You can try installing it again from the code, or I've put it up on userscripts here where you can use the "Install" button.
If you do see it but the bullet's not there then it's just not enabled, so all you have to do is turn it on and F5.
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To check that the script is installed properly and enabled, go to a page like http://archiveofourown.org/*works* where the * can be anything (anything that produces a non-404 page). Then in your Firefox toolbar menu go Tools -> Greasemonkey. The submenu that opens should have "ao3 download buttons" listed below the divider, with a little bullet or checkmark or whatever to show that the script is enabled. (Clicking the bullet/checkmark will toggle the script on or off, although the effects of toggling it won't show up until after a page refresh).
If you don't see it in that submenu it is either not installed or not being applied on the correct pages. You can try installing it again from the code, or I've put it up on userscripts here where you can use the "Install" button.
If you do see it but the bullet's not there then it's just not enabled, so all you have to do is turn it on and F5.