I briefly looked into implementing this because there are Electron options for this, and it does work with a couple of quirks. However, I won't be implementing this myself for now for these reasons:

You can only change the settings for new tabs (or ones that you close and reopen). Which is kind of inconvenient, but not a big problem.
Special pages such as newtab, help or version don't work. This is a big issue, as you won't be able to find help on the setting that you changed to disable JavaScript in the first place...

For now this does mean that I won't be able to implement this until a different solution is found to disable JavaScript. For those interested in continuing the work (by making the special pages work), the patch/diff for a working proof of concept is listed below:

diff --git a/app/renderer/settings.js b/app/renderer/settings.js
index c53688e..fd236ba 100644
--- a/app/renderer/settings.js
+++ b/app/renderer/settings.js
@@ -150,6 +150,7 @@ const defaultSettings = {
     "timeout": true,
     "timeoutlen": 1000,
     "vimcommand": "gvim",
+    "webfeatures": "javascript,images,webgl",
     "windowtitle": "simple"
 }
 let allSettings = {}
@@ -166,7 +167,8 @@ const listLike = [
     "spelllang",
     "startuppages",
     "storenewvisits",
-    "suggestorder"
+    "suggestorder",
+    "webfeatures"
 ]
 const validOptions = {
     "adblocker": ["off", "static", "update", "custom"],
@@ -558,6 +560,15 @@ const checkOther = (setting, value) => {
     if (setting === "suggestorder") {
         return checkSuggestOrder(value)
     }
+    if (setting === "webfeatures") {
+        for (const val of value.split(",").filter(f => f)) {
+            if (!["javascript", "images", "webgl"].includes(val)) {
+                notify(`Invalid webfeature passed: ${val}, `
+                    + "must be one of: javascript, images or webgl", "warn")
+                return false
+            }
+        }
+    }
     return true
 }
 
diff --git a/app/renderer/tabs.js b/app/renderer/tabs.js
index 74b1640..b8b956b 100644
--- a/app/renderer/tabs.js
+++ b/app/renderer/tabs.js
@@ -398,12 +398,16 @@ const unsuspendPage = page => {
             webview.setAttribute(attr, page.getAttribute(attr))
         }
     })
+    let webpreferences = "spellcheck=yes"
     if (appConfig().autoplay === "user") {
-        webview.setAttribute("webpreferences",
-            "spellcheck=yes,autoplayPolicy=document-user-activation-required")
-    } else {
-        webview.setAttribute("webpreferences", "spellcheck=yes")
+        webpreferences += ",autoplayPolicy=document-user-activation-required"
+    }
+    for (const feature of ["javascript", "images", "webgl"]) {
+        if (!getSetting("webfeatures").includes(feature)) {
+            webpreferences += `,${feature}=false`
+        }
     }
+    webview.setAttribute("webpreferences", webpreferences)
     const sessionName = page.getAttribute("container")
     ipcRenderer.send("create-session", `persist:${sessionName}`,
         getSetting("adblocker"), getSetting("cache") !== "none")

Uh oh!

Feature Request: Javascript enable/disable #264

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