Extension Tracker

Responsive Tester - Mobile View, Breakpoint Checker & CSS Editor

53 users No ratings yet Last updated 15 Sep 2026

By Mr Violets Live in the Chrome Web Store ekefkjaknejhmepccobnpdedfdkjcali Last checked 27 Sep 2026, 00:35 UTC

The listing

What the Chrome Web Store shows, as of the last check

Preview any page on multiple screens at once. Test mobile view, every screen size and breakpoint, and edit CSS live.Summary from the listing
Developer
Mr Violets
Category
Productivity › Developer Tools
First published
13 Jul 2026
Last updated
15 Sep 2026
Version
1.9.0
Size
303 KiB
Minimum Chrome
116
Languages
10 languages

Deutsch, English, Tiếng Việt, español, français, português (Brasil), português (Portugal), русский, हिन्दी, 日本語

Website
responsive-tester.app
Open in the Chrome Web Store ↗ View the code or download the CRX in CRX Viewer ↗
Users over time As shown on the Chrome Web Store

Tracking began on 27 Sep 2026. The chart appears after the second check.

Show the numbers
CheckedUsersRatingRatings
2026-09-2753––
Users, 7 days
–
needs a week of history
Users, 30 days
–
needs a month of history
Rank
#83,109
by users, of 264,703 extensions
In its category
#7,783
of 27,615 in Developer Tools

What changed

Every change found on a check, newest first

No changes found since tracking began on 27 Sep 2026.

What it can access

From the extension's manifest, in plain language

Every websiteIt can read and change your data on all the sites you visit.
Sites
  • <all_urls>Every website
Browser features
  • contextMenusAdd items to the right-click menu
  • declarativeNetRequestWithHostAccessBlock or change network requests on the sites it can reach
  • offscreenOpen a hidden page for background work
  • scriptingRun scripts on sites it can reach
  • storageSave settings and data in your browser
  • webNavigationFollow your browsing, page by page
Asked for later, if you agree
  • clipboardWriteChange what's in your clipboard

More from this developer

Other extensions from the same publisher account

ExtensionUsersRatingRatingsCategory
Screen Ruler - Measure and Inspect the Web60,000 4.2962 Developer Tools
Stay Awake: Keep Your Computer Awake10,000 4.673 Workflow & Planning
UI Inspector - Visual CSS Editor5,000 4.0021 Developer Tools
Marble: Automatically Organized Tab Groups2,000 4.5026 Workflow & Planning
Deep Tab Search: Tab Switcher & Search945 3.2512 Workflow & Planning
Quilt - Tiling Window Manager794 5.003 Workflow & Planning
CSS Viewer - Inspect & Copy Any Element's CSS470 –– Developer Tools
Pointer - Element Inspector for DevTools199 3.002 Developer Tools
AltCue - Tab Switcher– 1.001 Functionality & UI
All 10 extensions by Mr Violets →

About this data

Collected from the extension's public Chrome Web Store listing. It's checked every month, and again whenever a new version appears. Last checked 27 Sep 2026, 00:35 UTC; next check around 25 Oct 2026.

How we collect the data

Cite this page

Citation
Extension Tracker. “Responsive Tester - Mobile View, Breakpoint Checker & CSS Editor” (ekefkjaknejhmepccobnpdedfdkjcali). Chrome Web Store data, last checked 2026-09-27. https://extensiontracker.com/extension/ekefkjaknejhmepccobnpdedfdkjcali. Accessed 2026-09-28.
BibTeX
@misc{extensiontracker_ekefkjaknejhmepccobnpdedfdkjcali,
  title   = {Responsive Tester - Mobile View, Breakpoint Checker & CSS Editor (ekefkjaknejhmepccobnpdedfdkjcali)},
  author  = {{Extension Tracker}},
  year    = {2026},
  note    = {Chrome Web Store data, last checked 2026-09-27},
  url     = {https://extensiontracker.com/extension/ekefkjaknejhmepccobnpdedfdkjcali},
  urldate = {2026-09-28}
}

The data is free to reuse under CC BY 4.0.

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