The add-on will add a Cache Search option to the Firefox Tools menu. It will load a new window that contains a search form on top and two windows below which display the files that are found that include the search phrase and the source code of the page if one is selected.

Each page that has been found to contain the search phrase in the Firefox cache is displayed with information like its size, the times the search phrase was found in the file, the mime type, character and content encoding. Once a file has been selected the source code will be displayed in the second window. It will immediately jump to the first hit in the source code and highlight it so that it is easier to analyze it.

There are Next and Previous buttons that work in the second window that will jump forward and backward in the source code to highlight all the different hits in the source code.