You come across the problem that a feature does not longer seem to work with a certain release of a browser. The frequency at which Mozilla and Google release their browsers is at a high pace. And when software change, regressions can occur. Portable apps to the rescue. Just download your portable browser (e.g. Firefix Release x) from SourceForge. The positive side of potable browsers is that they require not an actual installation and hence you can typically also bypass any desktop policy restrictions too. Nice to run different browsers side-by-side without having to install/uninstall them.