For these of you not aware of the world of net extension improvement, a storm is brewing with Chrome. Google will cease help for manifest model 2, which is what the overwhelming majority of net extensions use. Manifest model 3 sees many modifications however the largest change is shifting from persistent background scripts to service staff. This…is…a…huge…change.
Adjustments from manifest model 2 to model 3 embody:
- Going from persistent background script to a service employee that may die after 5 minutes
- No use of
<iframe>parts or different DOM APIs from the service employee
- All APIs have grow to be Promise-based
- Restrictions on content material from a CSP perspective
One perform that net extensions usually make use of is executing scripts upon every new web page load. For an online extension like MetaMask, we have to present a worldwide
window.ethereum for dApps to make use of. So how will we try this with manifest model 3?
As of Chrome v102, builders can outline a
world property with a worth of
important (within the web page) for content material scripts. Whereas builders ought to outline
content_scripts within the extension’s
manifest.json file, the
important worth actually solely works (on account of a Chrome bug) whenever you programmatically outline it from the service employee:
await chrome.scripting.registerContentScripts([ id: 'inpage', matches: ['http://*/*', 'https://*/*'], js: ['in-page.js'], runAt: 'document_start', world: 'MAIN', , ]);
Within the instance above,
in-page.js is injected and executed inside the primary content material tab each time a brand new web page is loaded. This
in-page.js file units
window.ethereum for all dApps to make use of. If the
remoted, the script would nonetheless execute however would achieve this in an remoted setting.
Manifest model 3 work is sort of the slog so please hug your closest extension developer. There are various big structural modifications and navigating these modifications is a brutal push!
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