diff --git a/uBlock-Origin-works-best-on-Firefox.md b/uBlock-Origin-works-best-on-Firefox.md
new file mode 100644
index 0000000..27f7e36
--- /dev/null
+++ b/uBlock-Origin-works-best-on-Firefox.md
@@ -0,0 +1,31 @@
+This document explains why uBO works best in Firefox.
+
+### CNAME-uncloaking
+
+Ability to uncloak 3rd-party servers disguised as 1st-party through the use of [CNAME record](https://en.wikipedia.org/wiki/CNAME_record). The effect of this is to make uBO on Firefox the most efficient at blocking 3rd-party trackers relative to other other blocker-browser pairs:
+
+![c](https://user-images.githubusercontent.com/585534/103416937-b623c400-4b56-11eb-8e94-b4851a2248b7.png)
+
The dark green/red bars are uBO before/after it gained ability to uncloak CNAMEs on Firefox.
Source: [_"Characterizing CNAME Cloaking-Based Tracking
+on the Web"_](https://blog.apnic.net/2020/08/04/characterizing-cname-cloaking-based-tracking/) by [Asia Pacific Network Information Centre](https://www.apnic.net/about-apnic/)
+
+### HTML filtering
+
+[HTML filtering](https://github.com/gorhill/uBlock/wiki/Static-filter-syntax#html-filters) is the ability to the filter response body of HTML documents before it's parsed by the browser.
+
+For example, this allows removing specific tags in HTML documents before they are parsed and executed by the browser, something not possible in a reliable manner in other browsers. This feature requires the [`webRequest.filterResponseData()`](https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/webRequest/filterResponseData) API, currently only available in Firefox.
+
+### Browser launch
+
+At browser launch, Firefox will wait for uBO to be up and ready before network requests are fired in already opened tab(s). This is not the case with Chromium-based browsers, i.e. tracker/advertisement payloads may find their way into already opened tabs in Chromium-based browsers, while these are properly filtered in Firefox. Reliably blocking at browser launch is especially important for whoever uses default-deny mode of blocking.
+
+### Pre-fetching
+
+Pre-fetching, which is disabled by default in uBO, is reliably disabled in Firefox, while this is not the case in Chromium-based browsers. Chromium-based browsers give precedence websites over user settings when it comes to decide whether pre-fetching is disabled or not. See [documentation for _"Disable pre-fetching"_ ](https://github.com/gorhill/uBlock/wiki/Dashboard:-Settings#disable-pre-fetching).
+
+### WebAssembly
+
+The Firefox version of uBO makes use of WebAssembly code for core filtering code paths. This is not the case with Chromium-based browsers because this would require an extra permission in the extension manifest which could cause friction when publishing the extension in the Chrome Web Store.
+
+### Storage compression
+
+The Firefox version of uBO can use LZ4 compression to store raw filter lists, compiled list data, and memory snapshots to disk storage.
\ No newline at end of file