How to repair my jupyter notebook/lab

Question

When I code in jupyter notebook/lab, if I press enter, two new lines will be generated, like this:

If I press tab, the code hint appears, but the cursor jump to the next cell, like this:

These two problem appear recently, I have uninstalled all ipython & jupyter and reinstall, change browser from chrome to firefox, even when I code in google colaboratory and coursera's deeplearning exercise, except in pycharm.

Answer 1

I find a great tool solved these problem partly-- nteract , I can run local jupyter notebook in it, but the online jupyter notebook run in browser remains unnormal.

---

New in April 6, I finally find it! This is caused by a script of tempermonkey, which called remove-web-limits, just disable it and everything OK!