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Many web pages with fixed formatting do not fit on my screen without scrolling left to right. I suspect that in some cases the web page attempts to determine my screen width and adapt to it, but fails because I use a 125% or 150% zoom factor.
Some time ago, Opera had a simple command to override all preformatted line widths and force text scrolling, but I haven't found a general solution since then. I looked at the question How can I make Firefox word-wrap text/plain files? which had some answers for firefox, but both the extension suggested and the .css file seem to be out of date. I couldn't find any css files in my extension folder, so either they've changed it or I didn't understand where to look.
Ideally I would like a solution for Opera, but one for Firefox would be more helpful to the community and might be easier for someone to answer.
So, how can I force an unconditional text wrap to fit my screen in Firefox? Suggestions for any browser would be considered helpful, but an answer containing a solution for Firefox is preferred.
Just FYI, some stackexchange sites have the problem. Super User is good now, but Space Exploration extends off right edge. Usually it's ok, because the main text remains on the screen -- at worst I right scroll once to position the main text in the middle. – Bit Chaser – 2018-09-09T22:45:45.680