Description

In a 2018 addons.mozilla.org survey of 7,000+ people, an extension’s description was ranked as the most often used piece of information when deciding whether or not to get the extension.

The description is also important for search engine optimization. Without a description, it’s very hard for your page to rank at all in search results. To rank well, SEO experts recommend a minimum of 300 characters of quality content across your product page—and your description field makes up a good chunk of this.

Requirements

Required.
Minimum 10 characters.

Do This

Include the most important information in the first 250 characters as this will be displayed prominently on your product page. In those 250 characters, describe what your extension does and how it benefits the user. What problem does your extension solve? Does it save people time or money? Does it help them organize their online life? Tell the user why your extension matters to them: do not just describe features—explain the benefits!
Use sections in the formatting tool to break up the content beneath the first 250 characters. Create sections like “Features,” “How to Use,” and other relevant information.
Use the available HTML formatting to make your copy easier to scan. For example, list key features in bullets.
Run your description through a grammar checker to catch errors.
Ask a friend to proofread your description and let you know if something is unclear.
Incorporate keywords that someone might use to search for your add-on. But keep it natural—forcing keywords won’t improve search rankings or compel potential users.

Grammarly example:

Not this

Don't repeat your subtitle. This is a bad user experience that can erode trust. While your subtitle provides people with an idea of what your extension does, your description field is where they can get additional details and information.
Don't include bug fixes or address major issues. People visiting your page for the first time may be scared off by highlighting problems. Save these for your Release Notes. If you need to address a major improvement, list it as a feature. For example: “Starting with Adblock Plus 2.0, there is an option in Filter Preferences to allow some non-intrusive advertising.”
Don't include URLs of unrelated websites. These are considered spam and will be rejected.

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