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Best Header Modifier Alternatives
Here are some Firefox add-ons that are similar to Header Modifier:
Request Header Modifier
Jamie van Brunschot
42 5.00 
(1) Custom Header Injector
Süleyman Bilgin
1 0.00 (0) 
Header request Injector
JedGBC
2 0.00 (0) 
HeaderMod
UtilsFactory
308 0.00 (0) 
Header Editor
kirac.acar
1 0.00 (0) 
Header Override
Massimiliano
39 0.00 (0) 
HTTP Headers Customize
fumidzuki
2 0.00 (0) 
AddHeader
Firefox user 13564830
126 4.00 (2) Header Forge
Indie Dev
10 5.00 (1) Custom Header Values
TBednarek
5 0.00 (0) 
HeaderForge
Andrei Dev
1 0.00 (0) 
Header Ext
Braden
4 0.00 (0)