Clippings is a Mozilla Firefox and Thunderbird extension that maintains a database of frequently entered text snippets, which can be pasted into websites or emails. These clippings may contain built-in placeholders that will be filled-in when the text excerpt is pasted, such as the current date or time. Users are also able to create custom placeholders. When a snippet is pasted, Clippings prompts the user to provide values for each of the custom placeholders. A menu of available text excerpts is accessible either from the right-click context menu or through keyboard shortcuts, which users can also assign for even faster access to particular clippings. Users can organize their snippets into folders, color-code them, and back them up by exporting them into a variety of file formats. Text excerpt databases can be synchronized between Firefox and Thunderbird on the same computers or shared across Firefox browser windows on multiple machines. Clippings is free software, distributed under the Mozilla Public License, with source code available on GitHub via the About menu on the Clippings site.