A couple of ideas
It's possible that you have too many windows open in the browser. Try clicking on the list icon in the upper right hand of the browser window (in the title bar). You should get a drop down that includes the item 'windows'. Selecting this item will bring up a list of all of the open windows - sometimes quite a few of them. Use the 'x' to close all of them. Then click on the bookmark star, go to history, and select clear history in the bottom right hand corner.
Hope this helps - good luck!
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