Richtextbox tools bar menu is not display for Firefox and chrome. Any idea why this is happening?

Hello,
I have added RichTextField in custom webpart. I have added tag like below
<SharePoint:InputFormTextBox ID="RichTextField1" runat="server" TextMode="MultiLine" RichTextMode="FullHtml" Columns="20" Rows="10" RichText="true"  />
We are able to see Richtextbox tools bar menu in IE browser but it's not working for other browser like chrome and Firefox.
Can anyone suggest us why this is happening?
Any help would be appreciable.
Thanks,
Lovkesh Patel

Hi,
According to your description, my understanding is that the richtextbox tool bar menu not display in non_IE browser.
The richtext box not supported in Non-IE browser, it leads to the issue.
Here are some similar thread for your reference:
https://social.msdn.microsoft.com/Forums/sharepoint/en-US/c6482efb-72e1-4536-a3cb-153d838744a4/sharepoint-rich-text-editor-not-working-in-firefox-and-chrome
https://social.msdn.microsoft.com/Forums/sharepoint/en-US/8133e762-d996-4672-a176-aa37f45c46c0/sharepoint-text-control-with-rich-text-edit-tools-on-ribbon
Best Regards
Jerry Guo
TechNet Community Support

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