I cannt install erail.in. note is"erail pluginfor firefox could not be installed because firefox cannot modify the needed file". what should i do now

when i go to www.erail.net for train details. message as"click here to install plugin" displayed and clicked for install then the message "erail plugin for firefox could not be installed because firefox cannot modify the needed file"
so, further what should i do
regards. madhu

You usually get this error if you try to install an extension that needs to be unpacked to work properly. 
Current Firefox version do not unpack an extension automatically, but rename the xpi file to the extension's GUID.
An extension that needs to be unpacked should have an unpack flag in its install.rdf file
<pre><nowiki><em:unpack>true</em:unpack></nowiki></pre>
*https://developer.mozilla.org/En/Updating_extensions_for_Firefox_4.0#XPI_unpacking
You can try to set the extensions.alwaysUnpack pref to true on the about:config page.
The extension seems to install, but I haven't tested if it works.
*https://addons.mozilla.org/firefox/addon/erail-plugin-for-firefox/

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I cannt install erail.in. note is"erail pluginfor firefox could not be installed because firefox cannot modify the needed file". what should i do now

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