[v57+] Places Maintenance is built into Firefox.

Type about:support<enter> in the address bar.

You will find Places Database near the bottom. Press the Verify Integrity button.

When done, copy and post the results here.

> Task: checkIntegrity - Unable to check favicons.sqlite integrity: [Exception... "Could not open connection to E:\bwessels\AppData\Roaming\Mozilla\Firefox\Profiles\znmwuaji.Bruce\favicons.sqlite: 2153971713" nsresult: "0x80630001 (NS_ERROR_STORAGE_BUSY)" location: "JS frame :: resource://gre/modules/Sqlite.jsm :: openConnection/</< :: line 985" data: no] > Task: invalidateCaches - The task queue was cleared by an error in another task. > Task: checkCoherence - The task queue was cleared by an error in another task. > Task: expire - The task queue was cleared by an error in another task. > Task: originFrecencyStats - The task queue was cleared by an error in another task. > Task: vacuum - The task queue was cleared by an error in another task. > Task: stats - The task queue was cleared by an error in another task. > Task: _refreshUI - The task queue was cleared by an error in another task.

So I just tried restart with addons disabled and the issue was flipped ie the download icon showed no downloads and the downloads showed just one item. The clear all downloads button worked.

I restarted firefox with addons enabled and downloaded some files etc and everything appears to working again..

Thanks for your help

That was very good work. Well done. Please flag your last post as Solved Problem as this could help others with similar problems.