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Best Header Ext Alternatives
Here are some Firefox add-ons that are similar to Header Ext:
ModHeader
ModHeader
20K 3.37 
(67) 
Header Override
Massimiliano
27 0.00 (0) 
HTTP Header Plugin
Paul Pepper
2 0.00 (0) 
Header Editor
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11K 4.71 (183) 
HeaderTweaker
Maurice
3 0.00 (0) 
Simple Modify Headers - Extended
Warren Bank
293 5.00 (3) 
Headers
Kuba Zygmunt
507 5.00 (3) 
simple-modify-headers
Didierfred
6K 4.62 (37) 
Modify HTTP Headers
CirnoT
35 5.00 (1) 
Header Editor FG
Cecil Banks
4 0.00 (0) 
HTTP Headers Customize
fumidzuki
3 0.00 (0) 
ModHeader By GreatJIN
Byungsoo JIN
16 0.00 (0)