7,438 questions
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Is Services.prefs still accessible from Firefox extensions? [duplicate]
I want to read an option from about:config and revert it (0 → 1, 1 → 0).
In manifest.json I wrote:
…
"manifest_version": 2,
"name": "MyName",
"version": "1....
- 410 reputation score 410
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My firefox extension does NOT automatically start when I start my browser, don't know why
The title basically. I have a extension called NoClanker which blocks out AI websites automatically. It's been a while since I updated it since life got busy. The extension does not automatically ...
- 9 reputation score 9
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Update of self-hosted Firefox add-on not working automatically but manually – why?
I have a Firefox add-on ported from a Chrome extension and, for reasons of Mozilla policy, I have had to host it on a server of my own. In order for users to have their add-ons updated, I have created ...
- 719 reputation score 719
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139 views
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firefox extension: how do i write/update the side bar from firefox extension?
I'm writing a firefox (v.147) extension and I'm able to open a side bar.
How do I update/dynamically write messages (or add elements) from the extension onto the side bar?
- 957 reputation score 957
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Firefox WebExtension new-tab <video> briefly flashes black between poster and first frame, even though source video has no black frame
I am building a Firefox “New Tab” WebExtension that shows a full-screen looping video wallpaper (cat + fireplace). For perf reasons I try to show a static preview instantly and then fade into the live ...
- 137 reputation score 137
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Is there a way to get more detailed error messages from browser.scripting.executeScript?
I’m trying to run a simple script that extracts the length of a YouTube video inside of a tab from an extension in Firefox. I have code that looks like this:
try {
duration = await browser....
- 2,476 reputation score 2476
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React Router With Browser Extension Popup Window?
I'm trying to incorporate React Router into my Firefox browser extension to be able to display different pages in the extension's popup window. However, I keep getting the warning, You should call ...
- 335 reputation score 335
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Can modern Firefox addons/extensions edit user preferences (i.e. about:config properties)?
I keep toggling the preference full-screen-api.ignore-widgets via the Configuration Editor (i.e. about:config) and I'm wondering if Firefox would allow an extension to perform that change ...
- 538 reputation score 538
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browser.runtime.sendNativeMessage → An unexpected error occurred
To implement browser bookmark integration I’m trying to use Firefox native messaging on macOS. Even a trivial shell script that just writes to /tmp/test.log is never executed. Firefox just fails ...
- 16.3k reputation score 16290
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How to not trigger Firefox's strict Content Security Policy by my extension
I am currently contributing on an extension, and the main problem is that on Firefox, the CSP is being triggered, which causes quite a few issues. Mainly it seems to block the injection of dynamic CSS,...
- 1 reputation score 1
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Install modified XPI on Firefox or Fennec while disconnected from the internet [closed]
I want to download an XPI extension, and then add a console.log('hello, XPI world'); to one of its JS files. My browser is Fennec installed from F-Droid on Android.
I am looking for an equivalent to ...
- 81k reputation score 81008
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Getting around X-Frame-Options DENY in a Chrome extension? (2)
I have an iframe loading inside an extension page but unfortunately the document inside the iframe embeds its own iframes whose Content-Security-Policy I still can't circumvent with ...
- 1 reputation score 1
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Plasmo Firefox production build: Uncaught (in promise) Error: Could not establish connection. Receiving end does not exist
With plasmo 0.90.5, I faced this issue when trying to run my Firefox extension that I built with manifest v3. This issue happens when I try to pass a message to the content script.
Uncaught (in ...
- 292 reputation score 292
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339 views
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Is it possible to modify the body of an outgoing HTTP request in a Firefox add-on?
I am making a Firefox add-on and I need it to have the ability to modify the bodies of certain outgoing HTTP requests. The instructions for modifying headers are readily available on Mozilla's own ...
- 33 reputation score 33
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Unable to open Vue Devtools from Toggle or Select Components in Firefox/Chrome on macOS
Environment:
OS: macOS (e.g., Sonoma or Ventura)
Browsers tested: Firefox (latest), Chrome (latest)
Vue Devtools version: [7.7.7]
Vue version: [e.g., Vue 3.4.21]
Devtools installation method: Browser ...
- 19 reputation score 19