Is Polyscript - Dual Subtitles for YouTube, Netflix, Disney+ & Prime safe to install?

What data it declares

The developer declares that it collects these kinds of data:

• Authentication information such as passwords, credentials or PIN codes
• User activity such as clicks, scrolling, keystrokes or network monitoring
• Website content such as text, images or links on the pages you open

The developer also certifies that your data is not sold to third parties outside approved uses, not used for purposes unrelated to the extension's core function, and not used to decide creditworthiness or lending.

The listing links to a privacy policy.

This is the developer's own declaration in the Chrome Web Store. We cannot check it against what the extension does.

What Chrome asks you to allow

When you add it, Chrome asks you to allow it to:

• Read and change your data on a number of websites
• Read your browsing history
• Communicate with cooperating native applications

Derived from the manifest by Chrome's documented rules; the dialog's exact wording depends on your Chrome version and language. Chrome asks again if an update requests more.

What it can reach

Specific sites only: 35 match patterns.

• https://*.youtube.com/* youtube.com and all its subdomains
• https://*.youtube-nocookie.com/* youtube-nocookie.com and all its subdomains
• https://m.youtube.com/* only m.youtube.com
• https://*.youtu.be/* youtu.be and all its subdomains
• https://*.googlevideo.com/* googlevideo.com and all its subdomains
• https://*.ytimg.com/* ytimg.com and all its subdomains
• https://*.netflix.com/* netflix.com and all its subdomains
• https://*.primevideo.com/* primevideo.com and all its subdomains
• https://*.amazon.com/gp/video/* amazon.com and all its subdomains
• https://*.peacocktv.com/* peacocktv.com and all its subdomains
• https://*.paramountplus.com/* paramountplus.com and all its subdomains
• https://*.disneyplus.com/* disneyplus.com and all its subdomains
• and 23 more

Reaches your browsing data or every site

• Talk to an application installed on your computer nativeMessaging
• See the address and title of every tab you have open tabs
• Watch the network requests your browser makes webRequest

Worth knowing

• Block or redirect requests on the sites it can access declarativeNetRequestWithHostAccess
• Run its own code on the pages it can access scripting

Routine for an extension

• Act on the current tab, but only after you click it activeTab
• Schedule work to run later alarms
• Add items to the right-click menu contextMenus
• Run work in a hidden page offscreen
• Store data in your browser storage

Pages it runs its code on

It runs its own code on specific pages only: 39 site patterns.

• https://*.netflix.com/* netflix.com and all its subdomains
• https://*.viki.com/* viki.com and all its subdomains
• https://*.iq.com/* iq.com and all its subdomains

A content script is code the extension injects into pages matching these patterns. On those pages it can read and change what you see, whether or not a host permission is listed above.

Sites that can connect to it

Web pages matching these patterns can open a messaging channel to it: 2 site patterns.

• https://polyscript.app/* only polyscript.app
• https://www.polyscript.app/* only www.polyscript.app

Declared as externally connectable in the manifest: a page on these sites can exchange messages with the extension, for example to tell it you have signed in. It does not give the page access to your browser.

How usual this is for its category

In Productivity · Education, 17% of extensions ask for access to every site. This one: Access to specific sites only.

The typical extension there declares 3 browser permissions; this one declares 10 browser permissions.

• Talk to an application installed on your computer (nativeMessaging): under 1% of extensions in this category ask for it.
• See the address and title of every tab you have open (tabs): 21% of extensions in this category ask for it.
• Watch the network requests your browser makes (webRequest): 2% of extensions in this category ask for it.

Counted over the live extensions of the same category after our latest full pass of the store. A share is context, not a verdict: what is normal depends on what the extension is for.

Who uses it and how it is kept up

28 users

• Last updated in the store 56 days ago, on 2026-09-09.
• We have seen 3 new versions in the last 90 days.

What the store shows

• Established publisher The store's badge for publishers with a good record and no history of violations.

Has it asked for more over time?

This is the question a permission list on its own cannot answer. An extension that shipped narrow and widened later is a different proposition from one that always asked for the same thing.

1. 2026-09-06Asked for more permissions (45, was 41)
2. 2026-09-04Asked for more permissions (41, was 40)

Versions we have seen

1. 2026-09-10Version 1.104.1361
2. 2026-09-06Version 1.104.1341 · Asked for more permissions (45, was 41)
3. 2026-09-04Version 1.104.1180 · Asked for more permissions (41, was 40)

Who publishes it

sammomichael. This listing has been in the store since 2026-02-25 and was last updated on 2026-09-09.

Similar extensions that ask for less

Listings close to this one in what they say they do, which declare less reach. Less reach is not a verdict on either: compare what each needs for the job.

1. Sabi - AI Whisper & Dual Subtitles on Netflix, YouTube, Disney+, Viki No site access · 2 permissions 3k users ★ 4.5
2. Learnable: Learn Languages While You Watch Access to specific sites only · 2 permissions, 19 site patterns 196 users ★ 4.5
3. SubDuo — Dual Subtitles for Streaming Access to specific sites only · 3 permissions, 17 site patterns 58 users ★ 5.0

How to check or remove it in Chrome

1. Type chrome://extensions in the address bar and find the extension in the list.
2. Open its details. The site access setting shows where it can run; set it to run only on click and it reaches a page only after you press its icon.
3. To uninstall it, choose Remove on the same page.

Questions people ask

What can Polyscript - Dual Subtitles for YouTube, Netflix, Disney+ & Prime access?

Specific sites only: 35 match patterns. It declares 10 browser permissions.

What data does Polyscript - Dual Subtitles for YouTube, Netflix, Disney+ & Prime collect?

The developer declares that it collects these kinds of data: Authentication information, User activity, Website content. This is the developer's own declaration in the Chrome Web Store. We cannot check it against what the extension does.

Has Polyscript - Dual Subtitles for YouTube, Netflix, Disney+ & Prime asked for more permissions over time?

Its permissions changed 2 times while we watched, most recently on 2026-09-06.

Does Polyscript - Dual Subtitles for YouTube, Netflix, Disney+ & Prime publish a privacy policy?

Yes, the store listing links to a privacy policy.