Mozilla Firefox 33 is a web browser developed by Mozilla Foundation , available for download in full install version for Windows platforms from legacy sources. This version of Firefox was officially released on 2014-10-13 for public access and a brief summary of important updates and change log pertaining to this edition can be read below.

Firefox 33 was released with fixing the incomplete downloads by detecting broken HTTP1.1 transfers, though there are unfixed errors like incorrect PDF files native rendering, unable to overcome closing the browser window while AVAST antivirus scanning is active, unable to override certificate errors and slow webpage rendering while text selection of the active page.

There are many new changes to this edition including OpenH264 support, OMTC default enabling, Tiny and speedy JavaScript strings, HTTP proxy over HTTPS connections, session restoration redundancy and Content Security Policy (CSP) back end.