Cache Search is an experimental add-on for the Firefox web browser that allows the user to search the contents 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 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.
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Hoi Martin do you mean CacheSearch,
https://addons.mozilla.org/en-US/firefox/search?q=CacheSearch&cat=all ?
the link has been added. Have recently problems publishing posts which usually means returning to an earlier work copy of the article and as I usually add the links at the end it sometimes mean forgetting to add the link again.