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Best HeaderMod Alternatives
Here are some Firefox add-ons that are similar to HeaderMod:
ModHeader
ModHeader
20K 3.37 
(67) 
Header Override
Massimiliano
39 0.00 (0) 
Header Ext
Braden
4 0.00 (0) 
HTTP Header Plugin
Paul Pepper
5 0.00 (0) 
Modify Header Value
Milen
10K 3.62 (66) 
ModHeader By GreatJIN
Byungsoo JIN
28 0.00 (0) 
Configurable Header Manager
Marlon Wiss
1 0.00 (0) 
xHeader - Modify HTTP headers
App Pass
2 0.00 (0) 
Header Override
headeroverride.com
1 0.00 (0) 
Header Tool
loreii
19 0.00 (0) 
Header request Injector
JedGBC
2 0.00 (0) 
simple-modify-headers
Didierfred
6K 4.62 (37)