Closed Bug 1589607 Opened 10 months ago Closed 10 months ago

Site specific user agent override stopped working


(Core :: Networking, defect)

71 Branch
Not set





(Reporter: vitaliygrabchuk, Unassigned)



User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:71.0) Gecko/20100101 Firefox/71.0

Steps to reproduce:

Created settings:
general.useragent.site_specific_overrides = true = <Chrome UA>

Navigate to

Actual results: redirects to "Browser not supported" page

Expected results:

Web Skype loads and works correctly.

This worked before Firefox updated to version 71.0b1
Firefox 71.0b1 sends the default user agent instead of override.

Now only global general.useragent.override works and if it is set - override value is used and Web Skype works correctly.

This seems to be by design. see Bug 1513574

Blocks: 1513574
Component: Untriaged → Networking
Product: Firefox → Core

Those prefs were removed from Firefox.
I recommend you use and addon to set the UserAgent on a per-site basis. This one works great and is a verified extension:

Closed: 10 months ago
Resolution: --- → INVALID

This addon does not allow to create site specific overrides, it modifies user agent for entire browser (or window).
Was site specific useragent overrides feature completely removed and are no longer available even with addon?

Sorry, I can see there is a custom mode in addon options that allows site specific overrides, so ignore previous comment.


Duplicate of this bug: 1601109
Duplicate of this bug: 1601305
Duplicate of this bug: 1602876

I now installed this Extension: "User-Agent Switcher and Manager". With this works again. ( )

  1. Go to the plugin's settings and set the radio button to White list mode.
  2. Enter all relevant domains like, ... as a comma separated list
  3. Select the newest version of e.g. Edge by clicking from the Addon's icon
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