diff --git a/README.md b/README.md
index cf8ce70..00a951c 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,9 @@ node konstrui app.html kriptopter
 
 ### Standalone
 Open the file `kriptopter` in a browser.  
-_(Tested only under Iron/Chromium 63.0.3300.0, please do the test in other browser and submit an issue, with a minimum stack trace, if you want to help )_
+_(Tested only under Iron/Chromium 63.0.3300.0 and Firefox 60.0.2.6730, please do the test in other browser and submit an issue, with a minimum stack trace, if you want to help )_
+
+> Note on Firefox: you have to activate web components disabled by default in `about:config`, you need to set `dom.webcomponents.customelements.enabled` and `dom.webcomponents.shadowdom.enabled` to `true` for the app to work.
 
 ### Bookmarklet
 
@@ -31,8 +33,8 @@ node kompilo
 it will generate a `kriptoptlet` file containing the text to copy/paste in a new bookmark's url part.
 
 Or you can use the online version (not secure):
-```html
-<a href="javascript: win=window.open('','','titlebar=no,location=no'); fetch('https://git.p2p.legal/dig/kriptopter/raw/master/kriptopter').then(res=>res.text()).then(app=>win.document.write(app)  ))">bookmarklet online</a>
+```
+javascript: win=window.open('','','titlebar=no,location=no'); fetch('https://git.p2p.legal/dig/kriptopter/raw/master/kriptopter').then(res=>res.text()).then(app=>win.document.write(app)  ))
 ```
 
 ## Roadmap
diff --git a/app.html b/app.html
index 27a6908..a1063b0 100644
--- a/app.html
+++ b/app.html
@@ -1,6 +1,7 @@
 <title eo>Kriptopter</title>
 <title en>Cryptopter</title>
 <title fr>Cryptoptère</title>
+<meta charset="utf8"/>
 <style lang="eo,en,fr">
 	[_lang_] { display: none; }
 	:root[lang=_lang_] [_lang_] { display: inherit; }