Intel graphics drivers

Why do you think that you have to update the graphics driver?
What is wrong with the one that you currently are using?

For diagnostic purposes, what is the output of the commands
uname -a
lsb_release -crid
sudo lshw -C display

Thank you for answering I real need a knowledge person to help me, I been going in circles
and not coming to nothing concrete, first let me explain what made me to renew the drivers.
After an Ubuntu update I was searching on the web for a new calendar for my PC my Ubuntu Panel
disappear and Firefox tool bar change complete, the screen got shorter on the sides.
 Open Displays my screen was still on 1600 x 900(16:9) but no Panel.
Changed to 1440 x 900(16:10) the Panel come back, so now I can’t have full screen.
Looking in the web for help found I had to update the graphics drivers. It don't understand why
I download a .deb Intel graphics driver but Ubuntu refuses to install it. This why I ask for the driver.
On Additional Drivers it says “No proprietary drivers are in use”
luis@luis-Ubuntu-16:~$ uname -a
Linux luis-Ubuntu-16 4.4.0-72-generic #93-Ubuntu SMP Fri Mar 31 14:07:23 UTC 2017 i686 i686 i686 GNU/Linux
luis@luis-Ubuntu-16:~$ lsb_release -crid
Distributor ID: Ubuntu
Description: Ubuntu 16.04.2 LTS
Release: 16.04
Codename: xenial
luis@luis-Ubuntu-16:~$ sudo lshw -C display
[sudo] password for luis:
  *-display
       description: VGA compatible controller
       product: Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 06
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:27 memory:f7800000-f7bfffff memory:e0000000-efffffff ioport:f000(size=64)
luis@luis-Ubuntu-16:~$
Appreciate if help me to put this working properly
Thank you

I do not think that the graphics driver has anything to do with the Firefox toolbar disappearing.
You are using the i915 driver, which as far as I know is the right one. This driver is part of the kernel packages, and you are using the newest publicly available one for your Ubuntu release.
I do not see a reason for blaming the graphics driver.

I think I create some confusion referring Firefox.
The problem started with Ubuntu Panel disappearing and then notice the screen got narrower.
Went to Displays found the resolution still on 1600 x 900(16:9) so I changed to 1440 x 900(16:10)
the Panel come back but I want the some resolution as before 1600 x 900(16:9) but Ubuntu Panel doesn't shows with these resolution I search the web all reference found was for Unity launcher and top panel disappearing not like my problem.
I need your help to fix this and thank you.

It was the X Y screen position I wonder how it come out of the settings.
Thank you again of helping me.

Thanks Manfred Hampl, that solved my question.