After installing this add-on, here’s what happened in my case:


Improvements

I used to be unable to watch Netflix and Amazon Prime videos in Firefox, but now I can.


Issues

When YouTube videos are shared and embedded on the social media platform X, I frequently get a message saying “Cannot play on this device” when I click play (however, I can watch them if I go to the YouTube website. The issue only occurs with YouTube videos embedded on X).

Update:

I’m also getting the “Cannot play on this device” message and can’t play YouTube videos embedded on other websites.

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Does nothing, headers are not added for 127.0.0.1:8080/*

My fix for r*ddit while using Skip Redirect addon.

Beware - headers in Developer Tools are raw. If you see them unmodified, it does not mean the extension does not work..

good, simple and works

f- you, //i.redd.it/

Super basic, but it works well, unlike some other extensions that do the same thing.

simple-modify-headers 1.8.1 can't add, change or remove parts of URL!
simple-modify-headers 1.8.1 can't use parts of URL in many places...
simple-modify-headers 1.8.1 can't replace or remove parts of URL in many places...

The UI is modern / clean and relatively easy to understand unlike the bulk of other header modifiers I've tried. It's open source and free (there's no stupid paid for features) and there's no clause that says it will phone home. Last update was relatively recent in 2022. I may keep this one.

However I'm not having success with disabling CSP for testing purposes. I tried Action:Delete => Header:content-security-policy => Applied to both response/request and Action: Modifiy: content-security-policy | field value : (empty) | on response without success.

Anyways. After trying it for a little bit. Some features I would like to see if indication if the addon is running on the opened webpage, maybe an option to report that information in console and which rules are being applied, and a comparison of the original vs modified header. I hope the developer continues to improve upon this add-on.

Has the awful problem of working on all sites not just sites you ad. This breaks savealot, patreon, and other sites. It should have exclude option or ONLY include those rules you put in.

Works fine on Firefox 78.0.1 (64-bit).
Note: As Avinash-Bhat wrote in the SimpleModifyHeaders GitHub issue page, URL paths should not contain port. "http://localhost:1234" will match with "http://localhost/*".

It just .... simply works!