Tab preview UI for switching between images is buggy

[riteshsb]

1. I don't know if its correctly aligning the right last switched tab with each image as its hard to tell with dummy images. It is janky and does not switch to a certain number tab sometimes. There are some null errors showing up on the extension debugger on developer mode.
2. The UI is also janky as the white textbox randomly appears outside the images for some pages.
3. Lastly once we do use the data urls from the actual tabs I want to check the aspect ratio of each image. Right now I made it 200x200 to fit the screen for 5 images but we have to see if the HD full display and aspect ratio will still remain. We can use 'auto' for that to automatically calculate the height or width