You have two options depending on the browser you use. You can install the script as a Userscript in all popular browsers or as an Arc Booster in the Arc browser.
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Install a Userscript Manager of your choice. We recommend Tampermonkey or Violentmonkey.
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Install TJ Jira Panel by clicking this link.
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Create a booster for the Jira website.
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Copy the content of the Arc Booster script and paste it into the booster.