How do I disable Javascript in the stable version of Firefox in Android?

Sometimes I need to disable Javascript on some webpages for various reasons. From a rather old post on Mozilla Support and some other sources, I learned that it is done through

:config

. However, from the answer on this question on SE Android, I learned that

:config

is no longer accessible on the stable version of Firefox for Android. So I am back to the square 1, how do I disable Javascript in Firefox on Android? I have the following constraints in roughly the order of decreasing concern. Please keep these constraints in consideration while answering the question, but I am still welcome to learn about solutions that violate some of these constraints. 1. I do not want to use nightly or beta versions. They might have security vulnerabilities or unexpected behavior. 2. I do not want to change any Firefox configuration files on the file system, unless from within Firefox. I don't know much about Android application and I am afraid I might break something while messing with files. 3. I do not want to install any add-on on Firefox unless it is opensource or is widely known to be trustworthy.