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Control+F doesnt work on certain pages

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I click control+F but this function does not work on all sites and can't find matches even though I'm sure that word is on the site, so I have to switch over to Google chrome to use this function instead. Am I doing something wrong? It works sporadically. I took a screenshot of it working and not working. I try the exact same website in chrome and it allows me to search.

I click control+F but this function does not work on all sites and can't find matches even though I'm sure that word is on the site, so I have to switch over to Google chrome to use this function instead. Am I doing something wrong? It works sporadically. I took a screenshot of it working and not working. I try the exact same website in chrome and it allows me to search.
Pridėtos ekrano nuotraukos

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Works for me for the site in the first screenshot.

Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration or userChrome.css is causing the problem.

  • switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Themes
  • do NOT click the "Refresh Firefox" button on the Safe Mode start window