Custom UserAgent String

Add a custom useragent string for desired URLs or domains.

Custom UserAgent String - Change Browser's UserAgent with Ease

"Custom UserAgent String" is a Firefox add-on that enables users to effortlessly change their browser's user-agent by creating site-specific user-agent strings through the Options page. It features an ON or OFF switch button, the capacity to transform each URL into a domain, and provides over 100 sample user-agent strings. Users can also search for or disable specific user-agent strings.
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Add-on stats

By: Linder
Users: 1,376
73
Rating: 3.64
(33)
Version: 0.2.1 (Last updated: 2020-09-24)
Creation date: 2017-02-13
Weekly download count: 47
Firefox on Android: Yes
Risk impact: High risk impact
Risk likelihood:
Low risk likelihood
Manifest version: 2
Permissions:
  • storage
  • *://*/*
  • ws://*/*
  • wss://*/*
  • webRequest
  • webRequestBlocking
Size: 390.44K
URLs: Website

Ranking

# 2,614 ▲ 16
Other rankings
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Other platforms

Custom UserAgent String (v0.2.3)
3.85 (34) 30,000
Not available on Android
Not available on Edge
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Add-on summary

Analyze keywords

Custom UserAgent String is an add-on that enables you to easily change your browser's user-agent by adding site-specific user-agent strings from the Options page.

Some features:

  1. Add a custom user-agent string for each URL or website (domain).
  2. There is an option to change each URL to a domain from the options page.
  3. Toolbar popup has an ON or OFF switch button (left side).
  4. User agents can be added to the options page (more than 100 sample user-agent strings are also provided).
  5. For each user-agent string, you can either delete or disable it for future use.
  6. To find a user-agent string you can either use a search engine (there are plenty of websites that provide a free UA list) or use the sample list provided in addon's options page. This list includes more than 100 UAs for modern browsers and ranging from desktop to mobile platforms. This list is also available in the addon's homepage, FAQ section.

Note: to report bugs, please visit the addon's homepage and fill the bug report form.

Review on YouTube: https://www.youtube.com/watch?v=nz1534vwwls

User reviews

These summaries are automatically generated weekly using AI based on recent user reviews. Firefox Browser Add-ons does not verify user reviews, so some user reviews may be inaccurate, spammy, or outdated.
Pros
  • Works mostly as described
  • Allows domain or URL-specific spoofing
  • Functions effectively for advanced users
  • Works nicely on desktop
Cons
  • Cumbersome UI and difficult to use
  • Problems with wildcard (*) support
  • Non-intuitive configuration process
  • Incompatibility with Firefox for Android
Most mentioned
  • Difficulties in configurability and usability
  • Issues with wildcard support
  • Challenges with setting rules for multiple domains
User reviews
Very usefull, but UA data are too old, and I can't edit config which I added, only way is remove first then re-add it
by Firefox user 17505355, 2024-12-24
Worked perfectly no issues. Simple and sweet.
by Calum, 2024-05-02
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Add-on safety

Risk impact

Custom UserAgent String requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk likelihood

Custom UserAgent String has earned a fairly good reputation and likely can be trusted.

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