chrome.runtime.getURL("/index.html") in chrome extension causes pages to keep on loading

[rohankeskar19]

Description

I'm working on a chrome extension and I'm injecting a content script which injects a iframe of which src I'm setting to chrome.runtime.getURL("/index.html")

When I remove this line the pages load properly but this line causes the pages to keep on loading, I have tried this extension in google chrome and it works perfectly fine there, It was even working in brave before but I think some update broke it.

Steps to Reproduce

1. Create a chrome extension and add a content script and a index.html file
2. In content script inject an iframe into the page and set src of that iframe to chrome.runtime.getURL("/index.html")
3. Make sure the index.html is added in web_accessible_resources in manifest.json of the chrome extension

Actual result:

Pages don't finish loading

Expected result:

The pages should finish loading

Reproduces how often:

Easily reproduced

Brave version (brave://version info)

Brave 1.26.77 Chromium: 91.0.4472.164 (Official Build) (64-bit)
Revision 541163496c9982c98f61819bab7cf2183ea8180f-refs/branch-heads/4472@{#1569}
OS Windows 10 OS Version 2009 (Build 19043.1110)
JavaScript V8 9.1.269.39
User Agent Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.164 Safari/537.36
Command Line "C:\Program Files\BraveSoftware\Brave-Browser\Application\brave.exe" --enable-dom-distiller --disable-domain-reliability --no-pings --origin-trial-public-key=bYUKPJoPnCxeNvu72j4EmPuK7tr1PAC7SHh8ld9Mw3E=,fMS4mpO6buLQ/QMd+zJmxzty/VQ6B1EUZqoCU04zoRU= --sync-url=https://sync-v2.brave.com/v2 --lso-url=https://no-thanks.invalid --variations-server-url=https://variations.brave.com/seed --enable-features=PrefetchPrivacyChanges,WebUIDarkMode,PasswordImport,ReducedReferrerGranularity,AutoupgradeMixedContent,SafetyTip,WinrtGeolocationImplementation,LegacyTLSEnforced --disable-features=AutofillServerCommunication,FederatedLearningOfCohorts,HandwritingRecognitionWebPlatformApi,HandwritingRecognitionWebPlatformApiFinch,FlocIdComputedEventLogging,FledgeInterestGroups,InterestCohortFeaturePolicy,DirectSockets,TrustTokens,SignedExchangeSubresourcePrefetch,AutofillEnableAccountWalletStorage,FledgeInterestGroupAPI,EnableProfilePickerOnStartup,TextFragmentAnchor,SignedExchangePrefetchCacheForNavigations,NetworkTimeServiceQuerying,SubresourceWebBundles,IdleDetection,LangClientHintHeader,NotificationTriggers,WebOTP,FirstPartySets,InterestCohortAPIOriginTrial,LiveCaption --flag-switches-begin --flag-switches-end
Executable Path C:\Program Files\BraveSoftware\Brave-Browser\Application\brave.exe
Profile Path C:\Users\rohan\AppData\Local\BraveSoftware\Brave-Browser\User Data\Default
Variations AdRewardsStudy:NextPaymentDay
EphemeralStorageStudy:Enabled
NativeCosmeticFilteringStudy:Enabled
PermissionLifetimeReleaseStudy:Enabled

• Can you reproduce this issue with the current release?
• Yes

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields?
• No
• Does the issue resolve itself when disabling Brave Rewards?
• No
• Is the issue reproducible on the latest version of Chrome?
• No