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    <p>It's important to realize the separation between chrome scripts and content scripts. Chrome scripts are those that run with the same security privileges as Firefox - they have full access to Firefox and your computer. Content scripts are those that run with the same privileges as web pages. They can mess around with that web page, but are severely restricted otherwise. To maintain security, <a href="https://addons.mozilla.org/en-US/developers/docs/sdk/latest/modules/sdk/page-mod.html#Communicating%20With%20Content%20Scripts" rel="noreferrer">the way these two types of scripts can communicate is limited</a>. You wouldn't want a web page to be able to call any function it wants in your extension's internal code!</p> <p>Your main JS file (the one that includes <code>require('sdk/page-mod')</code>) is a chrome script. What you're injecting (<code>contentScript</code>) is (obviously) a content script. They can't communicate through a direct function call as you're doing.</p> <p>If your <code>getImgData</code> function is something that can be done with normal web page privileges, you can move your definition of it to within the content script. If it requires additional privileges, you must have your content script communicate with your chrome script via the <code>emit</code> and <code>on</code> functions as described in the link above.</p> <p>If you are going to make your content script any longer, I would recommend you <a href="https://addons.mozilla.org/en-US/developers/docs/sdk/latest/modules/sdk/page-mod.html" rel="noreferrer">separate it into its own file</a> to make your life easier.</p>
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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