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New Tab Page not showing thumbnails; browser.newtab.url reset is greyed out. What is my next step?

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I have read this thread: https://support.mozilla.org/en-US/questions/934935 but the solution this user found apparently isn't available to me.

I cleared my cache and cookies the other day, and now my New Tab Page isn't populating with new thumbnails. I do have one thumbnail, a page I pinned, but all of the others haven't come back. I went into about:config and found browser.newtab.url, but the 'reset' option was greyed out. I haven't been able to find out what the next step is to restore my thumbnails; am hoping someone here can help. Thanks!

I have read this thread: https://support.mozilla.org/en-US/questions/934935 but the solution this user found apparently isn't available to me. I cleared my cache and cookies the other day, and now my New Tab Page isn't populating with new thumbnails. I do have one thumbnail, a page I pinned, but all of the others haven't come back. I went into about:config and found browser.newtab.url, but the 'reset' option was greyed out. I haven't been able to find out what the next step is to restore my thumbnails; am hoping someone here can help. Thanks!

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Do you still see (empty) tiles on the about:newtab page?

Is the disk cache still working if you check that on the about:cache page via the location bar?

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I do still see empty tiles on the about:newtab page - I have the one pinned page, from before I cleared my cache, and then 8 empty tabs. The disk cache contains information up until just a few minutes ago so yep, appears to be working fine.