Bulk URL Opener

【What it does】 Paste URLs separated by newlines or commas, click one button, and every valid http/https link opens in its own background tab. The popup mirrors the browser language (English/Japanese), adds missing `https://`, and shows a live counter so you know the exact batch size. 【Key Features】 ・Live counter displays only entries that successfully parse as URLs ・HTTP/HTTPS validation blocks `javascript:` and other unsafe schemes ・Sequential tab creation smooths bursts; recommended batch size (30) appears as a hint ・Auto-normalizes schemes and surfaces inline errors inside the popup ・Runs entirely client-side with the minimal `tabs` permission; no analytics or network calls ・Clear button resets both the textarea and counter instantly 【Changelog】 v1.0.0: Initial release with bilingual UI, validation, sequential tab creation, and live counter. 【How to Use】 Enable Developer Mode on `chrome://extensions` and load the unpacked folder. Click the toolbar icon, paste newline/comma-separated URLs, and press **Open URLs**. Watch the status line for success or errors; keep batches near 30 for best results. 【Limitations】 ・Chrome desktop only—no scheduling, dedupe, or per-domain throttling ・Site-side rate limits/auth prompts are outside the extension’s control