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Words on websites could become bold or blurry after a Firefox upgrade. This article describes you how to fix this issue.

Words on websites could become bold or blurry after a Firefox upgrade. This article describes you how to fix this issue. __TOC__ {for win, not fx35} = Customize your text rendering settings = On Windows Vista/7, if you upgraded to Firefox 4, some websites may appear with blurry text. It might be caused by the DirectWrite feature that is used by Firefox to render text in websites when HW acceleration is enabled and available. # Make sure that DirectWrite is used in the graphic section of about:support. If not, skip the rest of the section. # Make sure Microsoft hotfix KB2454826 or Windows 7 SP1 is installed. # If the previous step didn't fix your issue, download the [https://addons.mozilla.org/firefox/addon/anti-aliasing-tuner/ Anti aliasing tuner extension]. <!-- http://forums.mozillazine.org/viewtopic.php?f=23&t=2060933&start=450 --> # If the previous step didn't fix your issue, disable HW acceleration from [[Options window - Advanced panel]]. {/for} = Check your Firefox font settings = If the previous step didn't fix your issue, verify your settings are correct: # [[T:optionspreferences]] # Select the {menu Content} panel. # Under Fonts and Colors, click {button Advanced...}. # The default settings are:{for win}<br/> <br/>[[Image:fonts.png]]{/for}{for mac}<br/> <br/>[[Image:58d3428da6f5e3a73080e863f2ce9a73-1272568810-224-1.png]]{/for} #*'''Fonts for:''' {pref Western} #*'''Proportional:''' {pref Serif} #*'''Size:''' {pref 16} #*'''Serif:''' {for win}{pref Times New Roman}{/for}{for mac}{pref Times}{/for}{for linux}{pref Serif}{/for} #*'''Sans-serif:''' {for win}{pref Arial}{/for}{for mac}{pref Helvetica}{/for}{for linux}{pref Sans-serif}{/for} #*'''Monospace:''' {for win}{pref Courier New}{/for}{for mac}{pref Courier}{/for}{for linux}{pref Monospace}{/for} #*'''Size:''' {pref 13} #*'''Minimum font size:''' {pref None} #*'''Default Character Encoding:''' {pref Western (ISO-8859-1)} = Troubleshoot your extensions = If the previous step didn't fix your issue, troubleshoot your extensions. To check, see [[Troubleshooting extensions and themes]]. {for win} = Check your Windows fonts = If the previous step didn't fix your issue, make sure that your fonts are not corrupt or missing: # [[T:closeFirefox]] # Open the run dialog. #*'''(7/Vista)''': Click the Windows {button Start} button. The Start Search box is the run dialog. #*'''(XP)''': Click the Windows {button Start} button, then select {menu Run...}. # Type {filepath %WINDIR%} and press {key Enter}. # Open the folder called {filepath Fonts}. # Verify that you have these fonts: #*''' Arial.ttf''' #*'''Arial Black.ttf''' #*'''Arial Bold.ttf''' #*'''Arial Italic.ttf''' #*'''Arial Bold Italic.ttf''' #*'''Times New Roman.ttf''' #*'''Times New Roman Bold.ttf''' #*'''Times New Roman Italic.ttf''' #*'''Times New Roman Bold Italic.ttf''' #*'''Courier New.ttf''' #*'''Courier New Bold.ttf''' #*'''Courier New Italic.ttf''' #*'''Courier New Bold Italic.ttf''' If you have a font that is a different name, rename it to be the right name. Examples: *Arial2.ttf instead of Arial.ttf *Arrial.ttf instead of Arial.tff {/for}