Remove noatb.css.

We're not using this CSS rule for extension detection anymore. Removing
it fixes a race condition on extension install in Firefox.

Makefile

@@ -261,7 +261,7 @@ BUILD_TARGETS += $(BUILD_DIR)/public/js/inject.js
 ## SASS
 SASS = node_modules/.bin/sass
 SCSS_SOURCE = $(shell find shared/scss/ -type f)
-OUTPUT_CSS_FILES = $(BUILD_DIR)/public/css/noatb.css $(BUILD_DIR)/public/css/options.css $(BUILD_DIR)/public/css/feedback.css
+OUTPUT_CSS_FILES = $(BUILD_DIR)/public/css/options.css $(BUILD_DIR)/public/css/feedback.css
 $(BUILD_DIR)/public/css/base.css: shared/scss/base/base.scss $(SCSS_SOURCE)
 	$(SASS) $< $@
 $(BUILD_DIR)/public/css/%.css: shared/scss/%.scss $(SCSS_SOURCE)

browsers/chrome-mv3/manifest.json

@@ -37,21 +37,6 @@
         "extension_pages": "script-src 'self'; object-src 'self'; frame-ancestors https://duckduckgo.com https://*.duckduckgo.com"
     },
     "content_scripts": [
-        {
-            "matches": [
-                "<all_urls>"
-            ],
-            "exclude_matches": [
-                "*://localhost/*",
-                "*://*.localhost/*"
-            ],
-            "match_about_blank": true,
-            "all_frames": true,
-            "css": [
-                "public/css/noatb.css"
-            ],
-            "run_at": "document_start"
-        },
         {
             "js": [
                 "public/js/content-scripts/autofill.js"

browsers/chrome/manifest.json

@@ -47,9 +47,6 @@
             ],
             "match_about_blank": true,
             "all_frames": true,
-            "css": [
-                "public/css/noatb.css"
-            ],
             "js": [
                 "public/js/inject.js"
             ],

browsers/firefox/manifest.json

@@ -48,9 +48,6 @@
             ],
             "match_about_blank": true,
             "all_frames": true,
-            "css": [
-                "public/css/noatb.css"
-            ],
             "js": [
                 "public/js/inject.js"
             ],

shared/js/background/wrapper.js

@@ -85,14 +85,6 @@ export function mergeSavedSettings (settings, results) {
 
 export async function getDDGTabUrls () {
     const tabs = await browser.tabs.query({ url: 'https://*.duckduckgo.com/*' }) || []
-
-    tabs.forEach(tab => {
-        insertCSS({
-            target: { tabId: tab.id },
-            files: ['/public/css/noatb.css']
-        })
-    })
-
     return tabs.map(tab => tab.url)
 }