Viewport Resizer: Ultimate Device Emulator & Website Testing Tool — permissions and source code

Emulate devices, resize screens, and perfect your web design effortlessly with this cutting-edge testing and presentation tool.

Users: 70 000
Rating: 4.2 / 5
Version: 2.0.4
Updated: December 17, 2025
Size: 134KiB
Category: Productivity

What this extension can access

These are the capabilities Viewport Resizer: Ultimate Device Emulator & Website Testing Tool declares in its manifest. Each one is a fact about the shipped code, not a judgement about the extension.

Reaches your browsing content

declarativeNetRequest

Block or redirect requests using preset rules.

scripting

Inject scripts into pages you visit.

Reaches browser state and activity

activeTab

Access the current tab, but only after you click the extension.

Local to the extension

storage

Store its own settings and data locally.

Websites it can read and change

<all_urls>

Read and change data on every website you visit.

Get this extension's source code

Download the .crx package or unpack it to read the source, entirely in your browser.

Download .crx Extract source code View on Chrome Web Store

Inside the package

Manifest version	MV3
Files	52
Unpacked size	435.6 KiB
Download size	134.1 KiB

File types

json · 43js · 4png · 4txt · 1

Code characteristics

Content Security Policy: script-src 'self'; frame-src 'self'