I have exactly the same problem with Ubuntu 20.04 and firefox 88.0.1. When I install the Debian package 'icaclient_21.4.0.11_amd64.deb' firefox can no longer open any page, but opera still works normally. When I remove the icaclient package, firefox works immediately (no need to close and restart firefox).
You can reload your WebExtension using the command "Firefox: Reload add-on" (extension.firefox.reloadAddon)from the VS Code command palette.The WebExtension will also be reloaded when you restart the debugging session, unless you have setreloadOnAttach to false.You can also use the reloadOnChange property to let VS Code reload your WebExtension automaticallywhenever you change a file.
firefoxExecutable: The absolute path to the Firefox executable or the name of a Firefox edition(stable, developer or nightly) to look for in its default installation path. If not specified,this extension will look for both stable and developer editions of Firefox; if both are available,it will use the developer edition. You can also override this property in your settings (see below).
Mozilla Firefox is a free, open-source cross-platform web browser. Use this tag if your question is related to the inner workings of Firefox or if it relates to code that is not working on Firefox which does work in other browsers. Questions about Firefox add-on development should be tagged [firefox-addon]. If your question is about using Firefox for browsing (i.e. as an end user) you should ask your question on Super User instead.
This tool will help you to create a Firefox profile with the defaults you like. You select which features you want to enable and disable and in the end you get a download link for a zip-file with your profile template. You can for example disable some functions, which send data to Mozilla and Google, or disable several annoying Firefox functions like Mozilla Hello or the Pocket integration. Each Setting has a short explanation and for the non obvious settings links to resources describing the feature and the possible problems with it. All Options Private Browsing only Start Annoyances Disable firefox intro tabs on the first start Disable the first run tabs with advertisements for the latest firefox features.
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