Just because the handful of extensions you use don't break doesn't mean that lots of others do, particularly when a new version of Firefox is released and extension X isn't listed as compatible in its manifest but is actually compatible so lets your install of Firefox know. And Mozilla sends folks our way when they want a portable version of Firefox to distribute on USB drives. We negotiated a license to use the Firefox trademarks. If you request a portable version of Firefox, ours is as official as it gets. They don't document or support it as a 'portable' implementation as it is not designed to be used as such. Note that this is the portable version of Firefox ESR.Well, if that's not enough for you, Mozilla calls the -profile switch a way to point to a specific profile. You really don't want to have to get into huge firefights because a browser update has caused problems, stability is far more important - and if that sounds like you then opting for Firefox ESR could be a very good idea. If you're managing Firefox deployment in a business, though, or anywhere else with a large number of users, then it's a different story. The version number alone tells you a lot: 68.0 is of course based on Firefox 68, so you'll be missing out on all the new interface tweaks, tab options and assorted browser speeds which Mozilla have added in the past few months. If you're a home user then this probably means that Firefox ESR isn't for you. Every time standard Firefox is updated, Firefox ESR will incorporate all the latest security updates in its own minor upgrade, so the program will be every bit as safe to use: you just won't have all the latest features. Of course this doesn't mean the browser will see no movement at all for an entire year. While standard Firefox sees a major release every 6 weeks or so, Firefox ESR will only move a whole release number every 54 weeks, meaning that you're much less likely to find some new tweak has broken your favourite extensions. Mozilla Firefox Extended Support Release (ESR) is, essentially, a slower-moving, more stable version of the regular browser.

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