Links to some legacy versions of Firefox portable are incorrect
On the Firefox page (https://portableapps.com/apps/internet/firefox_portable/) under the "Legacy Versions" section, there are links to old versions, but they are incorrect, e.g. for Firefox 3.6.28, it links to https://portableapps.com/apps/internet/firefox_portable/localization#leg..., but only FF v24 is available for download from there.