Add extension inspectors

[danfinlay]

Test plan

8110f82

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• Did you search for similar issues before submitting this one?

yes

• Describe the issue you encountered:

As an extension developer, I often inspect my extension in one of two major contexts:

• When clicking on the extension icon in the menu, I right-click that interface and select Inspect Element to get a Chrome inspector for that view.
• In the extensions list, I am used to having a background console link, to open a full Chrome inspector for the extension background process.

Neither of these inspectors seem to exist in Brave today.

• Platform (Win7, 8, 10? macOS? Linux distro?):

Mac OS 10.12.4

• Brave Version (revision SHA):

Brave 0.14.0
rev 215cba3

• Steps to reproduce:

1. Click on the extension icon in the menu,

2. Right-click that interface.

3. Notice no contextual menu, even though this is a web view.

4. Visit about:extensions.

5. Notice there are no links to open background inspectors.

• Actual result:

There seem to be no ways to inspect extensions and their behaviors.

• Expected result:

Extension developers need dev tools to debug their extensions.

• Will the steps above reproduce in a fresh profile? If not what other info can be added?

Yes

• Is this an issue in the currently released version?

I believe so.

• Can this issue be consistently reproduced?

Yes

• Extra QA steps:
  1.
  2.
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[jonathansampson]

@FlySwatter I believe we have what you're seeking, only it's not as easy to get to (not yet; I have a PR in the works to reduce friction).

1. Go to about:extensions and get the extension ID
2. Navigate to the background page via chrome-extension:///backroundpage.html.

If no explicit background page is provided, the file will be generated_background_page.html, IIRC.

This should open up an instance of the developer tools, pointing to the background page.

Please confirm whether or not this is what you were seeking.

[danfinlay]

Oh great, thanks for the tip! I'll continue debugging this soon!

[jonathansampson]

@FlySwatter Please confirm whether or not this is what you needed. We'll be making it easier to reach in future builds :)

[danfinlay]

Will verify soon, still 1 day left in the Internet Identity workshop (you'd probably fit in nicely here...)