Merlin
Custom UserAgent String

Custom UserAgent String

Add a custom useragent string for desired URLs or domains.

What is Custom UserAgent String?
"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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Merlin
Stats
By: Linder
Users: 1,449 ▼ -1
Rating: 3.61 (31)
Version: 0.2.1 (Last updated: 2020-09-24)
Creation date: 2017-02-13
Weekly download count: 120
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
Stats date:

Chrome-Stats Rank

# 2528 ▼ 8
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Other platforms

Custom UserAgent String
Custom UserAgent String (v0.2.3)
4.03 (32) 30,000
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Merlin
Summary
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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
User reviews summary
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
  • Allows domain or URL-specific spoofing
  • Works as described
  • Functions as the name says
  • Powerful for changing UserAgent
  • Works on desktop
Cons
  • Not compatible with Firefox for Android
  • Awkward UI
  • Unusable on small screens
  • Can't configure multiple hosts/domains
  • No easy access for making changes
Most mentioned
  • Does the job
  • Works as described
  • Awkward UI
  • Not compatible with Firefox for Android
  • Can't configure multiple hosts/domains
Recent reviews
Allows domain or URL-specific spoofing, exactly what I need.
by Firefox user 16978199, 2024-03-18
欢迎光临翻墙部落! 打开天窗，听听外面的声音! 穿越迷雾，寻找人生真谛! https://github.com/osurf/jzdy/blob/master/README.md?
by 翻墙部落, 2022-12-27
View all user reviews
Safety
Risk impact

Custom UserAgent String is risky to use as it requires a number of sensitive permissions that can potentially harm your browser and steal your data. Exercise caution when installing this add-on. Review carefully before installing. We recommend that you only install Custom UserAgent String if you trust the publisher.

Risk likelihood

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

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Screenshots
Custom UserAgent String Custom UserAgent String Custom UserAgent String