Remix plugin: Fix Blockscout explorer links

[manuelwedler]

When clicking the link to the contract code on Blockscout, the Blockscout instance blocks the http request browser blocks loading the resource. The URL seems to be fine as copying it to a fresh tab works. I think this might be related to the http request origin. We need to see if it is fixable, or otherwise report it to Blockscout.

[manuelwedler]

The issue seems to be that we are opening the link from an sandboxed iframe and the blockscout server sets this http header: cross-origin-opener-policy: same-origin

[manuelwedler]

I think this problem will actually not persist once the plugin is a native Remix plugin, because it won't be running inside an iframe anymore. Therefore, I'm closing this issue.

[manuelwedler]

I was wrong about the assumption that it won't be running in an iframe. If there isn't a fix for this we might have to disable Blockscout links.

[manuelwedler]

Had a look at the problem again and it seems adding allow-popups-to-escape-sandbox to the iframe's sandbox attribute would solve it. I will ask the Remix team if it will be possible to add it.

Here is a minimal reproduction btw: https://gist.github.com/manuelwedler/b39f3fe377f39683c2128138c3d4e5a0

[manuelwedler]

Implemented a hotfix for this here: ethereum/remix-project#5435

[manuelwedler]

Merged