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Can someone tell me why every I have to reset my options when a new version of Firefox is released?

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So I just installed the latest version, and I had to reset Tabs on Top to false, reset my font because the default is too small for me to see well, reset how I want PDF documents handled (I do NOT want them to open in the browser), and a few other nitpicky things. Is there some reason these preferences cannot be retained between updates?

So I just installed the latest version, and I had to reset Tabs on Top to false, reset my font because the default is too small for me to see well, reset how I want PDF documents handled (I do NOT want them to open in the browser), and a few other nitpicky things. Is there some reason these preferences cannot be retained between updates?

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Prefs should be retained between updates and not get lost.

Do you have nay numbered prefs-##.js file in the Firefox profile folder?

You may have a problem with your security software if you do not keep pref changes.

You can use this button to go to the Firefox profile folder:

  • Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)

You can set the layout.css.devPixelsPerPx pref to 1.0 or 1.25 (on Windows 8 the default DPI is 125%) on the about:config page (current default value is -1.0).

If necessary, adjust layout.css.devPixelsPerPx starting with 1.0 in 0.1 or 0.05 steps (1.0 or 0.9) to make icons show correctly.

Use an extension to adjust the text size in the user interface and the page zoom in the browser window.

Use this extension to adjust the font size for the user interface.

You can look at the Default FullZoom Level or NoScript extension if web pages need to be adjusted after changing layout.css.devPixelsPerPx.