README: Add note about disabling sync

Author: marcelklehr

README.md

@@ -14,11 +14,14 @@ Historically this was once possible using [the mozilla sync app](https://github.
 ## Install
 For this to work with your Nextcloud server, you need at least version v0.11 of the Bookmarks app installed. Once you've done that you can continue to install floccus in your browser as follows.
 
+**Note:** It is recommended to not enable native bookmark synchronization built into your browser, as it is known to cause issues.
+
 ### Chrome
 You can [install it via the Chrome Web store](https://chrome.google.com/webstore/detail/floccus-nextcloud-sync/fnaicdffflnofjppbagibeoednhnbjhg)
 
 Alternatively, you can still install it by [downloading the Chrome package from the latest release](https://github.com/marcelklehr/floccus/releases/) and dropping it into Chrome's extension page.
 
+
 #### Updating from 1.x to v2.0
 It is recommended to remove all of your bookmarks from your accounts before updating floccus, deleting them and after updating to reconnect them again, in order to prevent unforeseen problems!