Thanks! Yup, if you look at the bugzilla link I shared above, you'll see I mention this extension in the last comment: https://bugzilla.mozilla.org/show_bug.cgi

Thanks! Yup, if you look at the bugzilla link I shared above, you'll see I mention this extension in the last comment: https://bugzilla.mozilla.org/show_bug.cgi?id=237051#c11 https://bugzilla.mozilla.org/show_bug.cgi?id=237051#c11 . I couldn't check it as I run Tb beta (which the extension doesn't support last time I check), but I might give it a try next time I maintain one of these machines ..... or not: 0. They never ever need to click it to re-order. Why bother with an unneeded feature? 1. Extensions break! UserChrome.css too, but maybe less so :) , and a CSS rule is simpler/smaller in added complexity & potential for bugs than an extension. 2. Also, hiding the columns means one less bit of chrome to read/parse. Hiding stuff avoids misclicks, but also increases GUI legibility for people with bad eyesight.