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Best HTTP Manager Alternatives
Here are some Firefox add-ons that are similar to HTTP Manager:
HTTP Proxy Manager
adptly
3 0.00 
(0) 
User-Agent Header Manager
Viacheslav Zhabonos
1 0.00 (0) 
Headers
Kuba Zygmunt
518 5.00 (3) 
HackDuck - HTTP Request Debugger
fxe00
1 0.00 (0) 
Header Editor
泷涯
12K 4.71 (183) 
Universal Browser Manager
Jan Zavřel
32 4.15 (13) 
Shortcut Manager
bonur
18 2.33 (3) 
Advanced Proxy Manager
Proxy-Cheap
288 5.00 (16) 
Proxy Manager
EragonK
26 5.00 (2) 
Download Manager Turbo
Kirk
23 0.00 (0) 
Header Editor Lite
泷涯
259 0.00 (0) 
HDMX Browser Extension
ZZBuAoYe
1 0.00 (0)