The auto sync features is the most important update in Firefox 4. Here is an easy solution to help you sync firefox between PC and Android.
First, Download Firefox 4
download firefox 4 for Windows, Mac or Linux, then install it to your computer. Please note that firefox can Not update from version 3.6.8 to 4.0 if you have installed Firefox on PC, so please download the latest version from our website or Mozilla website.
Second
Create an account in Firefox Sync option. Just click Tools > Sync and register with your email address. Then Firefox will automatically sync your bookmarks, personal passwords, account id, browsing history etc into remote server. Please note you can always choose the data you wanna sync. And your personal information will be encrypted for security issue. So all of your personal information is safe.

Create an account - Step 1

Input your email address, username

Type in an security phrase, which will be asked when you wanna sync firefox in other devices.

Choose what data you wanna sync to remote server of Firefox. By default, Firefox Sync will sync everything. For Advanced Users, if you really want to customize your settings, you can Click on Sync Everything and set it to Use my custom settings to pick which items to sync. After you finish setting, Firefox will automatically sync your data.
Third Sync data with firefox 4
When you have sync data with firefox, then it's time to sync data to other devices with firefox.
Just like the first step, install Firefox to your devices, and go to firefox sync option. then login with your firefox account. You will be asked the security phrase to make sure that it's you that use the sync function instead of other person.
Then all of your saved bookmarks, history, password etc. will be synced from remote server.
