A week i go i shared this great guide from StackExchange on how to disable System Apps via Adb (Android Debug Bridge).
With this method you can easily disable the build in browser. You need a PC with Linux, Mac or Windows and with Android Debug Bridge installed (on Ubuntu simply run sudo apt-get install android-tools-adb) and set allow developer remote access to your fairphone (Settings -> Developer Settings).
Open a Terminal (Hit Super (Ubuntu) or CMD+Space (Mac), then type Terminal on Ubuntu) (or Cmd Prompt on Windows).
- Open the ADB shell by typing adb shell (You are now working on the device)
- Gain super user rights with su.
- Use the build in package manager to disable the browser: pm disable com.android.browser
- Leave the ADB shell with: exit
Use your Fairphone and see that Browser has magically disappeared from your Apps. And the best think is: If you ever need it again, you can replace “disable” in step 3 with “enable” and the browser is back!
If been using my Fairphone without the Android Browser since week with no problems at all.