There are quite a number of add-ons for Firefox that let you modify the user agent string, but I found User-Agent Switcher to be the most widely accepted with many good reviews.
FirefoxでUserAgentを切り替えてスマホ表示を確認する方法 | ウェブジ... 以前は、FirefoxでのUserAgent切り替え（スマホ表示の確認）には、アドオンと端末情報の手動追加が必要でしたが、2019年時点ではGoogle Chrome同様、容易に切り変えられるようになりました。 Extension UserAgent Switcher avec Firefox | Forum WebRankInfo j'invite les autres membres à compléter la liste en donnant d'autres user agent intéressants à configurer pour cette extension UserAgent Switcher #1 WebRankInfo , 10 Août 2005 Tymir WRInaute ... User-Agent Switcher
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/tech/ - Some arrogant inconsiderate cunt just turned off all… File: d04e36a8fd30547⋯.png (254.34 KB, 1200x1200, 1:1, 1200px-Firefox_Logo,_2017.….png) Freeware Alternative List - Software Discussion & Support… Yep, that kind of music is what they call Synthwave. NewRetroWave is one of YouTubes most famous synthwave promoters . Look him up. How To Change User Agent in Firefox - winaero.com If you are switching the user agent in Firefox frequently, you can save a lot of time and use the following extension: User-Agent Switcher Navigate to the link above and click on "Add to Firefox".
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Prior to Firefox 4 and Gecko 2.0, it was possible for extensions to add user agent parts through the general.useragent.extra.identifier preferences, (see the obsolete User Agent Strings Reference). But that has not been possible since bug 581008 .
