Tried Firefox 25 beta and 26 aurora from the site on Linux, with same bad rendering. Perhaps it renders things differently on the Mac, or uses different version

Tried Firefox 25 beta and 26 aurora from the site on Linux, with same bad rendering. Perhaps it renders things differently on the Mac, or uses different versions of libraries there. I have used 'Help->Submit feedback' to report it, is this the preferred way to report website issues, or are bugzilla entries better? https://input.mozilla.org/en-US/dashboard/response/3983188 https://input.mozilla.org/en-US/dashboard/response/3983188