This extension may look a bit frightening at first, but with some basic knowledge of http headers (and, luckily for me, no Chinese at all) it's really easy to do simple things.

The problem that Header Editor helped me to solve is as ancient as the hills: it's that infamous bug about how Firefox handles Content-Disposition: attachment headers (https://bugzilla.mozilla.org/show_bug.cgi?id=453455). A legacy extension needed replacing with Firefox Quantum. I tried a few specialized WebExtensions with little success (sometimes they worked, sometime they didn't), then I stumbled upon Header Editor.

Here I set up a single, simple rule to "Modify the response header", match type "All", execute type "normal", to always set the "Content-Disposition" header type to a value of "inline". That's it, two minutes to set up the whole thing, and it works beautifully!

Of course Header Editor can do much more complex things. With its support for custom JavaScripting it certainly has the potential to replace a whole bunch of smaller-scale extensions for all kinds of stuff related to http headers. In the right hands it can become a very powerful tool with endless possibilities. I guess that's about the best thing one can say about any piece of software.

Great.

总算有一个好用的,修改http头的扩展了,太感谢了.

这样就能快速开启/关闭 规则中某条规则而不必开启设置页面
ps：楼下那个是个喷子，在Referer Control和HE上无脑喷，上来就给1星

可以替代mason了。
不过希望能在图片右键菜单上增加反防盗链的快捷菜单，点击后打开设置页面弹出添加规则对话框，并自动填写好反防盗链的必要选项（规则类型、匹配类型、图片域名或域名的正则表达式、头名称等），类似mason那样的。
不然每次添加反防盗链的规则都要修改各种选项，有点麻烦。
非常感谢！

替代了Redirector和Referer Control, 基本替代了Feiruonet脚本的3大功能
能不能考虑把配置存在browser-extension-data下呢?

I first thought it won't be english so I avoided it for a while
working as it should
it can remove and modify headers
for redirect reqs I use Redirector (Wildcard is simple * $1 $2 ...)
but realy u need to update the icon :$

Edit:
Thanks for the fast reply & solution, I was able to replace my rules
IconArchive dotcom is a good place :D
I moved the button from the toolbar to the menu to appear in a bigger size and it's much better now :)