If you’re using our bookmarklet you’ll see ‘Push to Kindle’ somewhere on your bookmarks toolbar. If you right-click on it you should be able to edit it by clicking ‘Properties’. You should also be able to drag the Push to Kindle’ link on our page and place it next to your existing Push to Kindle link in your toolbar. You’ll then have two and can delete the old one. I don’t use Pale Moon but it’s based on Firefox it seems, so I think the steps should be the same or very similar.