Update: The add-on does not seem to be available anymore. A search on Mozilla's Firefox Add-ons repository returns no hit.
If you are using the Windows operating system, you can use MozillaCacheView by Nirsoft instead. It is a portable program that displays the cached contents of the firefox browser.
A similar extension, not completely but close, is CacheViewer2. It is a Firefox add-on that you can install that lets you browse the cache of the browser in a graphical user interface. It comes with a search option and filtering options, so that you can explore the cache or only the contents that you are interested in using it. Update End:
Cache Search is an experimental add-on for the Firefox web browser that allows you to search the content of the Firefox cache from within the web browser's interface. The Firefox add-on can only be installed after logging into the Mozilla website as this is required to download and install experimental Firefox extensions.
The add-on adds a Cache Search option to the Firefox Tools menu. If the Firefox menu bar is not displayed by default, you may tap on the Alt-key to reveal it.
When you select Cache Search, a new window is loaded. It features a search field at the top, and below that two panes. The first lists the files that were found based on the search phrase, the second matches in the code directly.
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 is displayed in the second pane. It jumps to the first hit in the source code immediately, and highlights 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.
Cache Search is a super useful Firefox add-on that finds Firefox cache files based on text that you enter in the extension's search form.
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Ghacks is a technology news blog that was founded in 2005 by Martin Brinkmann. It has since then become one of the most popular tech news sites on the Internet with five authors and regular contributions from freelance writers.