This is a Zotero add-on that allows for the direct installation of other add-ons in Zotero7.
For Zotero 6, see here.
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Download the latest release xpi file (only for Zotero 7)
For Zotero 6, download this xpi file.
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Install in Zotero
(Tools) -> (Add-ons)
After install this add-on in Zotero, click 
in Toolbar, or click Add-on market in Tools menu.
The main data source for add-ons comes from zotero-chinese/zotero-plugins.
Switch the source to (zotero-chinese) in Add-on Market to use this source.
If you have new add-ons to add, submit it to zotero-chinese/zotero-plugins.
Switch the source to (addon-scraper) in Add-on Market to use this source.
You can also use other custom data sources, as long as the data source format is consistent with the format in the zotero-chinese/zotero-plugins.
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Custom Data Source
zotero://zoteroaddoncollection/configSource?source=source-custom&customURL={encodeURIComponent(SOME URL)}can change add-on data source automatically to a custom url. -
Install Add-on from URL
zotero://zoteroaddoncollection/install?source={encodeURIComponent(SOME URL)}can install add-on from the custom url.