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This script allows you to save all articles forever and search by keywords within your Feedly. The data will be stored in IndexedDB, which has no limit on database's size in Firefox. Also this is server-friendly, because all processes are done in client side and all data are stored in local storage("indexedDB" folder in your Firefox profile). Confirmed working on Firefox 17+ with Scriptish.
Hand Glass Icon: Toggle search box.
Title, URL and Body checkboxes: Specify the search targets.
RegExp option: Search by regular expressions.
Inserting whitespace between terms means AND search.
Searching can be aborted by clicking the progress button.