Firefox initially popped open a window stating that I already had another copy open and so wouldn't open. After some investigating, I found a fix and followed the steps to delete profiles - possibly the cause of the errors. (I had applied this solution once months ago and it had worked then.) Subsequent to this attempt, I was unable to open Firefox - even with the creation of new profile(s). Given the situation, I deleted Firefox entirely by dragging into Trash and emptying the trash and re-logging in. Downloaded a clean new install from the Mozilla website. Although the DMG file downloaded fine, when I attempt to copy app to Applications folder, the system hangs. So now there is no way to re-install Firefox?!
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This link /post seems to reflect my condition: https://support.mozilla.org/bm/questions/1240427However at the given location on my computer, I only had a FB video plugin - even after i deleted that, there is no change, i.e. remain unable to implement a fresh new install of Firefox.
Suggestions?Thanks!RT12
p.s. Using a different computer to post this. When I get a chance, I'll go back to the one with this issue and see if I can post the 'troubleshooting information'.
On June 30th, macOS 10.9, 10.10 and 10.11 users will automatically be moved to the Firefox Extended Support Release (ESR).
Firefox 10 For Mac Os High Sierra
While Apple doesn’t have an official policy governing security updates for older macOS releases, their ongoing practice has been to support the most recent three releases (i.e. version N, N-1, and N-2). The last security update applicable to macOS 10.11 was made available nearly 2 years ago in July 2018 (https://support.apple.com/en-us/HT201222). Unsupported operating systems receive no security updates, have known exploits, and can be dangerous to use, which makes it difficult and less than optimal to maintain Firefox for those versions.
Users do not need to take additional action to receive those updates. On June 30th, these macOS users will automatically be moved to the ESR channel through application update.
In the meantime, we strongly encourage our users to upgrade to mac OS X 10.12 or higher to benefit from the security and privacy updates.
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For more information please visit the Firefox support page.