The printing on the web page overlap, making it difficult to make a selection
The script lines on web pages overlap.
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Reset the page zoom on websites that look wrong: "View > Zoom > Reset" (Ctrl + 0 (zero))
See http://kb.mozillazine.org/Zoom_text_of_web_pages
If you increased the minimum font size then try a lower setting (default is none) as a too high value can cause issues like you described.
- Tools > Options > Content : Fonts & Colors: Advanced > Minimum Font Size
- Tools > Options > Content : Fonts & Colors: Advanced > "Allow pages to choose their own fonts, instead of my selections above"
See also Websites look wrong or appear differently than they should
Other things that need attention.
See http://www.mozilla.com/plugincheck/
Your above posted system details show outdated plugin(s) with known security and stability risks that you should update.
- Shockwave Flash 10.0 r42
Update the Flash plugin to the latest version.