Fix CORS issues in FireFox

[sunify]

Fixes #1779

Looks like Firefox requires adding all HTTP addresses to manifest.json, so I added addresses for rinkeby, kovan, ropsten and mainnet.

Verified on:
https://dapp.acebusters.com
http://registrar.ens.domains/

[kumavis]

This isnt really a CORS issue is it? CORS headers are (afaik) correctly set in infura responses.
Does firefox not allow any requests from extensions to domains not allowed? can we find a reference on MDN for this?

@Zanibas will need to add the conversion rate api as well

i wonder if you can do second level wildcard: *.infura.io

[sunify]

See Host permissions https://developer.mozilla.org/en-US/Add-ons/WebExtensions/manifest.json/permissions

You are right about wildcard, will update asap.

Also, will add https://api.cryptonator.com (there are no issues with conversion, just for consistency).

[kumavis]

Host permission

The extra privileges include:

XMLHttpRequest and fetch access to those origins without cross-origin restrictions (even for requests made from content scripts)
the ability to inject scripts programmatically (using tabs.executeScript) into pages served from those origins
the ability to receive events from the webRequest API for these hosts
the ability to access cookies for that host using the cookies API, as long as the "cookies" API permission is also included.
bypass tracking protection if the host is a full domain without wildcards. Doesn't work with <all_urls>.

so for:

XMLHttpRequest and fetch access to those origins without cross-origin restrictions (even for requests made from content scripts)

However CORS headers should be set correctly by infura
Perhaps its the x-metamask-origin custom header.
We encountered this issue with mascara.

[kumavis]

reaching out to infura team...

[kumavis]

@tmashuang did you verify its working correctly after infura's changes?

[tmashuang]

The main issue on Firefox that this solves is viewing tokens. Even after the Infura headers view tokens is still not visible in Firefox. I am in favour of these additions for Firefox.

[sunify]

@tmashuang @kumavis any updates?

[tmashuang]

Fixes Firefox failing fetch resource #1779