I dont understand about the tab limit
What don't you understand? Why there is a limit? The software developers had to set some limit on the number of tabbed windows that could be open...they chose a total of 6 windows. How to delete tabs? That has been discussed several times in previous posts.
The reason that tabbed windows shows up is controlled by the website developer. In some cases, when you click on a link, the next webpage is downloaded and it replaces the one in your current tabbed window...you still only have one tabbed window. On other websites, clicking on a link forces another tabbed window to open...this will happen on your phone or even if you are on a full computer using the browser. To close this new tabbed window, you must go up and click on the "X" on the tab. Thus, the same thing on the phone...you must find the other tabbed windows and tap the "X" to close it.
I've found that when on the phone with these tabbed windows, using the back arrow (one of the four buttons along the bottom of the phone front face) will automatically close the tabbed window I was looking at. Don't use the back arrow on the website...try the back arrow on the phone.
Kurt