Firefox 无法将文件安装至 http://xxxx原因为: 不预期的安装错误 详情请查看错误控制台日志。 -203

来自http://tunps.com/firefox-error-203

前几天安装了win7,在安装之前把firefox的资料都用mozbackup备份了一次，然后安装好了后还原，问题就来了。cookie,密码,缓存都正常，就是扩展里面一片空白，于是心想估计是丢了，无所谓就重新下载，结果安装任何的扩展都出现这样的错误：

Firefox 无法将文件安装至 http://xxxx原因为: 不预期的安装错误 详情请查看错误控制台日志。 -203

google了，也有人出现这样的问题，但是没有明确的解决方法，最后在http://kb.mozillazine.org/Unable_to_install_themes_or_extensions_-_Firefox找到了答案。里面列出了所有的出现无法安装卸载扩展的原因和解决方案，用查找搜索“203”定位到这里：

Corrupt extension files

Files that store information about the extensions you have installed can sometimes be corrupted. Deleting them can fix a number of extension issues; they will be regenerated the next time you start Firefox. [17][18]. Exit Firefox completely, then open your Firefox profile folder (read the linked article for its location) and delete* these three files:

extensions.ini

extensions.cache

extensions.rdf

• Note : Although unwanted files/folders can be deleted, renaming them is generally considered a safer option. This achieves the same result, but allows the user to retrieve any possibly required information from them later on. In the case above, rename the above 3 files as , 'extensionsOLD.ini', 'extensionsOLD.cache', 'extensionsOLD.rdf'

Unexpected installation error -203

Installing themes or extensions may fail with the message, Unexpected installation error -203. (If this occurs after a Software Update you may find that add-ons that were previously installed also do not work.) Follow the above directions to remove corrupt extension files. [19] If the problem is not resolved and you use ZoneAlarm or CA Firewall, disable it temporarily (enable Windows Firewall in the interim) to allow the installation. [20] If the problem persists, your profile may be corrupt (bug 361358). Use the Profile Manager to create a new profile [21] or create a new default profile [22] and then transfer your data to the newly-created profile.

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搞了半天结果是扩展损坏造成的，解决方法是：删除 C:\Users\tun\AppData\Roaming\Mozilla\Firefox\Profiles\3neukyyj.default （win7系统是这个目录，找不到这些文件，用windows搜索。）目录下的extensions.ini extensions.cache extensions.rdf 这3个文件，当然最好是备份，免得数据丢失。删除后这3个文件重新生成，也就是说里面关于扩展的记录都消失了，全部扩展需要重新安装。