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Error 228 Firefox Add On

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Thunderbird and Sunbird. You may not be able to install or update Firefox themes or extensions for a number of reasons, including: Contents 1 Not compatible 2 Incorrect user agent 3 Software installation disabled 3.1 Enabling software http://kb.mozillazine.org/Unable_to_install_themes_or_extensions_-_Firefox installs 3.2 Allowing the site to install 4 Unsecured updating 5 Downloaded theme or https://www.quora.com/What-does-download-error-228-mean-when-I-am-trying-to-install-updates-of-Firebug-and-YSlow-on-Firefox extension will not install 6 Download Error -228 7 Invalid file hash 8 Corrupt extension files 9 Unexpected installation error -203 10 JavaScript disabled 11 Conflicts with other extensions 11.1 All-In-One Sidebar extension 12 Conflict with Windows High Contrast - Accessibility options 13 See also [edit]Not compatible Extensions and themes are designed to work with certain Firefox versions. Attempts this site to install incompatible extensions will result in an error alert saying, " could not be installed because it is not compatible with Firefox . ( will only work with Firefox )". Advanced users can disable extension compatibility checking in Firefox 2 and above by adding the boolean preference extensions.checkCompatibility and setting it to false. Use with caution. [1] Extensions that have been installed by turning off compatibility testing with extensions.checkCompatibility set to prevented this site false are clearly marked in the Add-On listing with a white exclamation point on a red background overlaying the lower left corner of the icon associated with the add-on. [edit]Incorrect user agent Your browser user agent may be incorrect, causing the add-ons site to report that the extension is for an older version of Firefox or that you must upgrade Firefox to use the add-on. [2]. If you are using an add-on such as User Agent Switcher, restore the default user agent (or restart Firefox). Otherwise, open about:config and enter general.useragent in the filter box. If any of the general.useragent preferences are shown as user set (they will be in bold type), open the context (right-click) menu and select "Reset" to restore the default setting. Note that some extensions, including MegaUpload Toolbar and Microsoft .NET Framework Assistant, add an extra user agent string. [3] [4] [edit] Software installation disabled Websites are only allowed to prompt you to install an extension or theme if you have the functionality enabled and if you have allowed that specific site to do it. [edit]Enabling software installs Some users may have disabled the software installation option based on security issues which have since been resolved [5]. To re-enable: Firefox 2: The yellow message bar says, "Software installation is currently disabled. Click Enable and

 

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