DevTools slow performances and colors problem in the "Sources" tab

[JacopoSciampi]

Description

The DevTool "sources" tab show the code in just white color (I have the dark mode activated) and the performances while debugging some code are very bad. The same code debugged in Chrome or other browsers is working fine.

Actual result:

As I said, slow performances and something is wrong with colors. See attached pictures.

Expected result:

I except Brave to work like Chromium.

Reproduces how often:

Everytime in every site. I tried unistalling and re-installing the browser in order too see if the problem solve, without success.

Brave version (brave://version info)

Brave	1.1.20 Chromium: 79.0.3945.74 (Official Build) (64-bit)
Revision	99b6d241cf84f7fa7434ae8a59f9e74eb1464280-refs/branch-heads/3945@{#888}
OS	Windows 10 OS Version 1909 (Build 18363.535)
JavaScript	V8 7.9.317.29
Flash	32.0.0.303 C:\Windows\system32\Macromed\Flash\pepflashplayer64_32_0_0_303.dll
User Agent	Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.74 Safari/537.36
Command Line	"C:\Program Files (x86)\BraveSoftware\Brave-Browser\Application\brave.exe" --profile-directory=Default --enable-dom-distiller --disable-domain-reliability --no-pings --extension-content-verification=enforce_strict --extensions-install-verification=enforce --enable-oop-rasterization=Enabled --sync-url=https://no-thanks.invalid --enable-features=PasswordImport,SimplifyHttpsIndicator,WebUIDarkMode --disable-features=AutofillServerCommunication,LookalikeUrlNavigationSuggestionsUI,NotificationTriggers,SyncUSSBookmarks,AllowPopupsDuringPageUnload,WebXR,AudioServiceOutOfProcess,SmsReceiver,UnifiedConsent,WebXrGamepadModule --flag-switches-begin --flag-switches-end --enable-audio-service-sandbox --disable-webrtc-apm-in-audio-service
Executable Path	C:\Program Files (x86)\BraveSoftware\Brave-Browser\Application\brave.exe
Profile Path	C:\Users\jacop\AppData\Local\BraveSoftware\Brave-Browser\User Data\Default

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.

Miscellaneous Information:

Photo taken in Brave

Photo taken in Chrome (79.0.3945.79)

The color being this different can mean that something didn't load up properly (I guess) but I haven't found a way to solve this.

[LesterCovax]

Looks like the same issue as this one.

@bsclifton says...
This may be fixed now; with Nightly (and it'll work its way down through channels), you can enable remote debugging under brave://settings/privacy. When this is enabled, it should fetch sources

[bsclifton]

Closing as a dupe of #5618 (thanks for the assist, @LesterCovax!)

@JacopoSciampi this is fixed in Developer and Nightly versions of the product (NOTE: you have to enable remote debugging under brave://settings/privacy). I created a PR now to uplift this to our Beta branch (1.2, shipping January 6th) since there have been a recent bump in requests:
brave/brave-core#4228