The Pale Moon Project - Custom-built and optimized Firefox browsers for Windows Operating Systems

Known issues in the current version

Development notes

The Pale Moon browser, at any point in time, may have a number of known issues. These known issues will usually be addressed in the next release of the browser, or it may be something that people have noticed and are mentioned here because they are "by design", i.e.: issues people have asked about, are known, and are this way on purpose.
For each issue, check the status for intended action to be taken in development (if any) and intended timeline (if applicable).

Known issues in 20.0.1:
  1. On certain systems, rendering of text and graphics may become "pixelated"
    If you are using Windows 7 SP1 with the recently (Feb 28th 2013) released Windows Platform Update (KB 2670838), or potentially also if you are using Windows 8, and your system is equipped with an ATI/AMD Radeon HD3000 or HD4000 series graphics processor, you may encounter issues with rendering text and graphics in page content, similar to:

    This is caused by the combination of OS, the Platform Update which makes changes to DirectX acceleration, and the graphics hardware/drivers in your system. Microsoft is still triaging this issue, and has pulled the update as a critical update (it is currently optional). Note that it may be installed as a prerequisite for using MSIE 10.
    Workaround: See http://forum.palemoon.org/viewtopic.php?f=1&t=2228
    Status: [Triage]
Known issues in the 3.6.* versions (Legacy, discontinued):
  1. Some sites render particularly slow or stall the browser, or don't display correctly.
    This is caused by the websites in question using more modern website coding, notably more advanced HTML5 and CSS3, that is not and will not be supported by the Legacy version of Pale Moon (the Gecko rendering engine used in this version does not properly support it).
    Solution: Upgrade to the Next Generation version of Pale Moon (if your hardware and O.S. support it).
    Status: [Inherent, won't fix]
Known issues in all versions:
  1. The browser creates directories under %APPDATA%\Mozilla, specifically Mozilla\Extensions
    These directories are related to the underlying Mozilla extension code (Pale Moon is a Mozilla-based browser) and stores extension IDs there. This issue is completely harmless and non-breaking; in fact, having (all) Mozilla-based applications use this one central location for extension IDs is desired.
    Status: [By Design]

Known issues in previous versions

Because issues in previous versions may still apply to what people are running, here is a recap of previous, still recent versions that have been fixed, and potential workarounds:

19.0:
  1. When selecting a bookmark to "Open in the sidebar" in the bookmark options, a parsing error is given instead of the page in the sidebar.
    This is caused by a removed context menu item in the Firefox code base, and Pale Moon lacking the proper definition of the restored item in the sidebar.
    Workaround: Download a replacement browser.jar here and replace the browser.jar file in Pale Moon's installation chrome folder (e.g. C:\Program Files\PaleMoon\chrome) with the one in the .zip
    Status: [Fixed]
    Timeline: Fixed in Pale Moon 19.0.1
15.3.2:
  1. Some CSS/HTML combinations cause the browser to hang.
    This is caused by a rendering issue in the Direct2D back-end, which occurs on certain systems with relatively poor CSS/HTML page design.
    Workaround: In about:config, set gfx.direct2d.disabled to true and restart the browser.
    Status: [Fixed]
    Timeline:     Fixed in Pale Moon 15.4

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