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Editorial Team
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Asked: 2026-05-19T11:45:52+00:00

I’m trying to build an extension for Firefox with localized name basing on information

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I’m trying to build an extension for Firefox with localized name basing on information from https://developer.mozilla.org/en/Localizing_extension_descriptions (Localizing before Gecko 1.9), but it doesn’t work. The error in the browser’s Javascript console is:

Błąd: [Exception... "Component returned failure code: 0x80004003 (NS_ERROR_INVALID_POINTER) [nsIRDFService.GetLiteral]"  nsresult: "0x80004003 (NS_ERROR_INVALID_POINTER)"  location: "JS frame :: file:///C:/Program%20Files/Mozilla%20Firefox%201.5/components/nsExtensionManager.js :: EM_L :: line 225"  data: no]
Plik źródłowy: file:///C:/Program%20Files/Mozilla%20Firefox%201.5/components/nsExtensionManager.js
Wiersz: 225

My extension files hierarchy is:

gemgecko.xpi:
              /install.rdf                   
              /components/gemgecko.dll                   
              /defaults/preferences/prefs.js                          
              /chrome.manifest                  
              /chrome/locale/pl/install.properties
              /chrome/locale/en/install.properties

/defaults/preferences/prefs.js:

pref("extensions.gemgecko@gemius.pl.name", "chrome://gemgecko/locale/en/install.properties");

/chrome/locale/en/install.properties:

extensions.gemgecko@gemius.pl.name=gemiusAudience study

/chrome/locale/pl/install.properties:

extensions.gemgecko@gemius.pl.name=Badanie Megapanel PBI/Gemius

Can anybody help me to find an error in my extension?

Edit

I’m adding install manifest…

/install.rdf:

<?xml version="1.0" encoding="UTF-8"?>
<RDF xmlns="http://www.w3.org/1999/02/22-rdf-syntax-ns#" 
xmlns:em="http://www.mozilla.org/2004/em-rdf#">
<Description about="urn:mozilla:install-manifest">
    <em:id>gemgecko@gemius.pl</em:id>
    <em:version>2.01</em:version>
    <em:name>nazwa</em:name>
    <em:creator>tworca</em:creator>
    <em:description>opis</em:description>
    <em:homepageURL>http://www.test.pl</em:homepageURL>

    <em:targetApplication>
        <Description>
            <em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id> <!-- firefox -->
            <em:minVersion>1.5.0</em:minVersion>
            <em:maxVersion>*</em:maxVersion>
        </Description>
    </em:targetApplication>

</Description>

</RDF>

I’ve tested it on Firefox 1.5 and 3.6. On 3.6 everything seems to work OK, but on 1.5 doesn’t – the extension manager displays the extension’s name from install.rdf not from chrome://gemgecko/locale/install.properties…

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1 Answer

  1. Editorial Team

    chrome://gemgecko/locale/en/install.properties looks to be wrong to me, the /en/ is not part of the chrome: URL, it is substituted when the chrome: URL is converted.

    EDIT:

    I don’t see any chrome registration entries in your chrome.manifest. They should look something like this:

    locale gemgecko pl chrome/locale/pl
locale gemgecko en chrome/locale/en
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