Readme Updated for firefox User

[Preeti9764]

📌 Fixes

Fixes #201

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📝 Summary of Changes

• Added steps of insatllation of extension in the firefox browser.

Summary by Sourcery

Update README with detailed Firefox installation instructions and compatibility guidance

Documentation:

• Add step-by-step instructions for loading the extension in Firefox including notes on temporary loading and persistence
• Include compatibility notes for chrome.* APIs in Firefox and links for troubleshooting and polyfill use
• Refine formatting and wording in Chrome installation section and token generation steps

[sourcery-ai]

Reviewer's Guide

This PR enriches the README by standardizing Chrome instructions, introducing detailed, persistent Firefox installation steps and compatibility notes, and cleaning up formatting and typos throughout the document.

File-Level Changes

Change	Details	Files
Overhauled extension installation instructions	Standardized Chrome steps with consistent punctuation and capitalization Replaced minimal Firefox guide with step-by-step load process, persistence notes, and compatibility guidance Added links to Firefox Developer Edition, AMO signing requirements, and MDN compatibility resources	README.md
Cleaned up formatting and fixed typos	Removed commented-out blocks and extraneous hyphens Normalized bullet list indentations and list markers Corrected typos (e.g., “insatllation” → “installation”)	README.md

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#201	Update the README to include instructions for Firefox users on how to install and use the Scrum Helper extension.	✅

Possibly linked issues

• Update README to include instructions for using Scrum Helper on Firefox #201: The PR adds the requested Firefox setup guide and notes to the README.md file.
• Update README to include instructions for using Scrum Helper on Firefox #201: The PR adds detailed Firefox installation and usage instructions to the README, directly fulfilling the issue's request.

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[sourcery-ai]

Hey @Preeti9764 - I've reviewed your changes - here's some feedback:

• Clean up the leftover HTML comment markers and commented-out blocks in the Firefox section so readers aren’t confused by stray “<!--” markers.
• Standardize list item punctuation (either end all items with periods or drop them consistently) and ensure heading capitalization is consistent across sections.
• Consider restructuring the installation guide to consolidate shared steps for Chrome and Firefox and highlight only the differences to reduce redundancy.

Prompt for AI Agents

Please address the comments from this code review:
## Overall Comments
- Clean up the leftover HTML comment markers and commented-out blocks in the Firefox section so readers aren’t confused by stray “<!--” markers.
- Standardize list item punctuation (either end all items with periods or drop them consistently) and ensure heading capitalization is consistent across sections.
- Consider restructuring the installation guide to consolidate shared steps for Chrome and Firefox and highlight only the differences to reduce redundancy.

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[vedansh-5]

@Preeti9764 @hpdang Why do we need this now, considering the extension isn’t usable on Firefox yet?

[vedansh-5]

I get this error.