Can I force a re-parse of a page so that visited links are treated as unvisited?
I'm looking for a way of viewing a used page as if for the first time - i.e. of re-parsing it so that the visited links revert to the colour etc that css defines for unvisited links.
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You can clear the visited history of that page.
Another way is to disable the visited link colors. You can do that by (temporarily) setting the pref layout.css.visited_links_enabled to false on the about:config page.
To open the about:config page, type about:config in the location (address) bar and press the "Enter" key, just like you type the url of a website to open a website.
If you see a warning then you can confirm that you want to access that page.