Hi, what page are you opening to ? It is a google map error re javascript by what ever page you are opening has the error or Firefox is seeing the error and letting you know about.

Suggest you update to version 60.0.2 to see if that fixes the issue. Help --> About to update.

Please let us know if this solved your issue or if need further assistance.

If you use extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) that can block (wanted) content (Adblock Plus, NoScript, Disconnect, Ghostery, Privacy Badger, uBlock Origin) always make sure such extensions do not block (wanted) content.

• make sure your extensions and filters are updated to the latest version

Firefox shows the shield icon at the left end of the location/address bar in case content is blocked by Tracking Protection.

• click the shield icon for more detail and possibly disable the protection
• check the Web Console for more detail about what content is blocked by Tracking Protection
• "3-bar" menu button or Tools -> Web Developer

• https://support.mozilla.org/en-US/kb/tracking-protection-firefox

You can try these steps in case of issues with web pages:

You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.

• hold down the Shift key and left-click the Reload button
• press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• press "Command + Shift + R" (Mac)

Clear the Cache and remove the Cookies from websites that cause problems via the "3-bar" Firefox menu button (Options/Preferences).

"Remove the Cookies" from websites that cause problems:

• Options/Preferences -> Privacy & Security
  Cookies and Site Data -> Manage Data

"Clear the Cache":

• Options/Preferences -> Privacy & Security
  Cookies and Site Data -> Clear Data -> Cached Web Content: Clear

Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration is is causing the problem.

• switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Appearance
• do NOT click the "Refresh Firefox" button on the Safe Mode start window

• https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

MTaty said

Upon opening Firefox, this message appears in a box in the middle of the page. "Deleted Api Project Map Error - See https://developers.google.com//maps/documentation/javascript/error-messages#deleted-api-project-map for more information" I've gone to the site shown but can't find this error message. I can click "OK" and move on. But what does it mean?! What does is WANT of me?!

Tried it. Error message still pops up. Thanks for responding.

Pkshadow said

Hi, what page are you opening to ? It is a google map error re javascript by what ever page you are opening has the error or Firefox is seeing the error and letting you know about. Suggest you update to version 60.0.2 to see if that fixes the issue. Help --> About to update. Please let us know if this solved your issue or if need further assistance.

Note: this update doesn' t support AmazonSmile or Zappos plugins. So lost those. Life is so hard. Tried it. Error message still pops up. Thanks for responding.

Welcome. SO if continuing with this Do not need to Blockquote everything, as it is not necessary, we know what we said. Use it only on select parts of text that need to be emphasized. https://www.w3schools.com/tags/tag_blockquote.asp

Let's go for the gusto : please try a Refresh but Note that this does more than uninstalling and re-installing does. Normal uninstalling does not remove some preferences which may have become corrupt. Please Refresh but do this 1st: Delete your Cookies and Cache and TEST.

• https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer
• https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles

then

• https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings

TEST....... If no issues then Extensions which need to be added back in 1 at a time and tested ..... Or it is your Profile : Make a new one and test ...:

• https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles

If is your Profile :

• https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile
• http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

Note: Any customization will revert back to default, you will also need to reinstall Extensions.

Please let us know if this solved your issue or if need further assistance.

Replacement Extensions :

• https://addons.mozilla.org/en-US/firefox/search/?platform=windows&q=AmazonSmile

You can search for shopping Extensions from the above URL, there are many.