Showing content from http://support.mozilla.org/en-US/kb/home-page-pipe-character-opens-extra-tabs-firefox below:
Home page with pipe character opens extra tabs when Firefox starts
Firefox sets multiple home pages when you separate each address with a pipe character (|) or vertical bar. This feature may lead to problems when an individual home page address contains a pipe character.
Here's how to fix it:
- In the Menu bar at the top of the screen, click and then select or , depending on your macOS version.Click the menu button and select .
- Select the panel.
- In the Home Page text box, replace all pipes (|) with %7C.
- Close the page. Any changes you've made will automatically be saved.
- In the Menu bar at the top of the screen, click and then select or , depending on your macOS version.Click the menu button and select .
- Select the panel.
- In the Homepage and new windows text box for Custom URLs…, replace all pipes (|) with %7C.
- Close the page. Any changes you've made will automatically be saved.
Tip:
If removing the pipe character doesn't solve the problem, add-ons or malware might be causing this behavior. Try
refreshing Firefox
to remove add-ons without erasing your browsing information and bookmarks.
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