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Best OpenHeader Alternatives
Here are some Firefox add-ons that are similar to OpenHeader:
Modify Header Value
Milen
10K 3.62 
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Overhead — HTTP Header Editor
theconcept technologies
2 5.00 (1) 
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Header Editor Lite
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184 0.00 (0) 
HeaderMod
UtilsFactory
308 0.00 (0) 
FlexHeaders - Modify HTTP Headers
Harrison Deo
439 5.00 (2) 
Header Ext
Braden
4 0.00 (0) 
NoobHeaders
BioSs
12 0.00 (0) 
simple-modify-headers
Didierfred
6K 4.62 (37) 
Configurable Header Manager
Marlon Wiss
1 0.00 (0) 
ModHeader
ModHeader
20K 3.37 (67) 
Headers
Kuba Zygmunt
546 5.00 (3)