To use these add-ons, you'll need to download Firefox.

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Iceggiren i User-Agent Switcher and Manager

User-Agent Switcher and Manager sɣur Ray

4,1 n yitran ɣef 5
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Icegger-it criticabug
sɣur criticabug, pred 6 rokmi
Per-window User-Agent is nice. It'd better if it were persistent beyond Firefox restarts. Currently I have to set the user-agent for a window after Firefox started.