Sometimes if a web page claims to require JavaScripts, the text can still be viewed if you disable CSS as well as JavaScripts. Another thing you could try is view source; sometimes the text or data will be visible in there, or you can find a link.
An idea which might be able to help more, is a script substitution feature, allowing the user to substitute their own scripts for some or all of the existing ones (and enable or disable or limit the rest of the scripts), by the URL or by the hash (if there is a integrity attribute, then it will not be necessary to download the file in order to determine its hash).
An idea which might be able to help more, is a script substitution feature, allowing the user to substitute their own scripts for some or all of the existing ones (and enable or disable or limit the rest of the scripts), by the URL or by the hash (if there is a integrity attribute, then it will not be necessary to download the file in order to determine its hash).