Too Wide!
Sites such as Wikipedia insist on using the full width of the screen. This add-on adds a contextual menu (right-click) item which allows you reduce the width of the document body.
What is Too Wide!?
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Summary
Sites such as Wikipedia insist on using the full width of the screen. For many of us, this means it renders the page much too wide to be comfortably readable.
This add-on adds a contextual (right-click) menu which allows you to toggle the width of the current page.
By default, the new width will be 960px. You can adjust this in preferences.
Although designed to work with Wikipedia and its cousins, it will also work with many other pages designed a long time ago, before wide screens became fashionable.
User reviews
Safety
Risk impact
Too Wide! may not be safe to use and it requires some risky permissions. Exercise caution when installing this add-on. Review carefully before installing.
Risk likelihood
Too Wide! has earned a fairly good reputation and likely can be trusted.